10 Keto-Friendly Tuna Recipes for Low-Carb Dieters

Got a pantry full of canned tuna and no idea what to make? Same. I’ve been there more times than I can count.

These keto tuna recipes are the ones I keep coming back to. Quick, filling, low carb, and honestly way better than you’d expect from a can of fish.

Let’s get into it.

1. Keto Tuna Avocado Boats

Ingredients:

• 2 ripe avocados, halved and pitted
• 2 cans (5 oz each) tuna in water, drained
• 2 tablespoons mayonnaise
• 1 tablespoon finely diced white onion
• 1 teaspoon lime juice
• Salt and black pepper to taste

Instructions:

Step 1: Drain your tuna really well. Like, press it against the side of the can with a fork and squeeze out as much water as you can. Nobody wants a soggy avocado boat. This step matters more than people think. Wet tuna makes the whole filling watery and sad.

Step 2: In a bowl, mix together the drained tuna, mayonnaise, diced onion, and lime juice. Season with salt and pepper. Give it a good stir until everything is combined. Taste it right here. Too bland? Add more lime. Too thick? A tiny splash of water loosens it right up.

Step 3: Cut your avocados in half and remove the pits. If you want more room for filling, scoop out a little extra avocado flesh with a spoon and just mix it right into the tuna. I do this every single time now. It adds creaminess and you waste nothing.

Step 4: Spoon the tuna mixture generously into each avocado half. Pile it up. Do not be shy here. Finish with a squeeze of fresh lime over the top and a little pinch of black pepper. Serve immediately because avocado waits for no one.

2. Creamy Keto Tuna Salad (No Sugar Mayo)

Ingredients:

• 2 cans (5 oz each) tuna in water, drained
• 3 tablespoons full-fat mayonnaise (no sugar added)
• 1 tablespoon Dijon mustard
• 2 stalks celery, finely chopped
• 2 tablespoons red onion, minced
• 1 tablespoon fresh lemon juice
• Salt and black pepper to taste
• Mixed greens or lettuce for serving

Instructions:

Step 1: Drain the tuna and break it apart in a mixing bowl with a fork. You want it flaked, not mushed into a paste. There is a texture difference and it matters. Take your time here, it takes maybe 30 seconds.

Step 2: Add the mayo and Dijon mustard. This combo is honestly the secret. The mustard cuts through the richness of the mayo and adds this tiny tangy kick that makes the whole salad taste more interesting. Wondering if you can skip the mustard? You can, but try it at least once first.

Step 3: Fold in the celery and red onion. The crunch from the celery is my favorite part of this whole recipe. It makes every bite more satisfying. If you only have green onion, that works great too.

Step 4: Squeeze in the lemon juice, season with salt and pepper, and stir everything gently until combined. Taste and adjust. Serve over mixed greens or just eat it straight from the bowl. No judgment here, I do that all the time.

3. Keto Tuna Egg Salad

Ingredients:

• 2 cans (5 oz each) tuna in water, drained
• 3 large hard boiled eggs, chopped
• 1 cucumber, thinly sliced
• 2 tablespoons mayonnaise
• 1 teaspoon Dijon mustard
• 1 tablespoon lemon juice
• Salt and pepper to taste
• Fresh basil or parsley for garnish

Instructions:

Step 1: Hard boil your eggs. I know, I know, you know how to boil eggs. But here is the thing, I used to overcook mine every time and get that gross gray ring around the yolk. Bring water to a boil, lower your eggs in gently, cook for exactly 10 minutes, then move them straight to an ice bath. Perfect yolks, every time.

Step 2: While the eggs cool, mix your drained tuna with mayo, mustard, and lemon juice in a bowl. Season with salt and pepper. This base is creamy and tangy and already smells amazing at this point. Patience.

Step 3: Peel and roughly chop the eggs. You want real chunks, not a fine mince. Fold them into the tuna mixture gently so the yolk pieces stay somewhat intact. Looks messy right now, trust the process.

Step 4: Arrange your cucumber slices around the plate and pile the tuna egg salad right in the center. Tuck a few fresh basil leaves on top. It looks restaurant-level and took you maybe 15 minutes. You are doing great.

4. Garlic Butter Seared Tuna Steak

Ingredients:

• 2 fresh tuna steaks (6 oz each, about 1 inch thick)
• 2 tablespoons unsalted butter
• 3 cloves garlic, minced
• 1 tablespoon olive oil
• 1 tablespoon fresh parsley, chopped
• Salt and black pepper to taste
• Lemon wedges for serving

Instructions:

Step 1: Pat your tuna steaks completely dry with paper towels. This is non-negotiable if you want a good sear. Moisture is the enemy of a golden crust. Season both sides generously with salt and pepper right before cooking.

Step 2: Heat a cast iron skillet or heavy pan over high heat until it is seriously hot. Add the olive oil and let it shimmer. Lay the tuna steaks down and do not touch them. I burned a tuna steak once by poking at it too much. Just let it sear undisturbed for 2 minutes per side. Okay, now the fun part.

Step 3: Lower the heat to medium. Add the butter and minced garlic to the pan. The butter will start foaming and sizzling around the tuna and it smells absolutely incredible at this point. Tilt the pan slightly and use a spoon to baste the garlic butter right over the top of the steaks for about 30 seconds.

Step 4: Remove the tuna from the pan and let it rest for 2 minutes. Spoon any remaining garlic butter from the pan right over the top, scatter fresh parsley, and serve with lemon wedges. The center should still be slightly pink. That is exactly right.

5. Spicy Keto Tuna Lettuce Wraps

Ingredients:

• 2 cans (5 oz each) tuna in water, drained
• 3 tablespoons mayonnaise
• 1 tablespoon sriracha (adjust to taste)
• 1 stalk celery, finely diced
• 2 tablespoons red bell pepper, finely diced
• 1 tablespoon lime juice
• 8 large butter lettuce leaves
• Salt and pepper to taste

Instructions:

Step 1: Mix the mayo and sriracha together in a small bowl first before adding anything else. Taste this spicy mayo on its own. Too spicy? Add more mayo. Not spicy enough? Add more sriracha. Get it exactly where you want it now because it is much easier to adjust at this stage.

Step 2: Add the drained tuna to the spicy mayo and mix it all together. Fold in the diced celery and red bell pepper. The pepper adds a subtle sweetness that balances the heat really nicely. Squeeze in the lime juice and season with salt and pepper.

Step 3: Wash and separate your butter lettuce leaves. Pick the biggest, cupped ones you can find because they hold the filling way better. Lay them out on a plate like little bowls. This is my favorite part. It looks so pretty before you even add the filling.

Step 4: Spoon the spicy tuna mixture into each lettuce cup. Do not overfill or they will fall apart when you bite into them. A nice rounded tablespoon per cup is just right. Serve immediately while the lettuce is still crisp and cold.

6. Tuna Zucchini Boats

Ingredients:

• 3 medium zucchini, halved lengthwise
• 2 cans (5 oz each) tuna in water, drained
• 3 tablespoons mayonnaise
• 1 teaspoon garlic powder
• 1 teaspoon onion powder
• Salt and black pepper to taste
• 1/2 cup shredded cheddar cheese
• 2 tablespoons grated Parmesan cheese
• Fresh parsley for garnish

Instructions:

Step 1: Preheat your oven to 400 degrees F. While it heats up, slice the zucchini in half lengthwise and use a spoon to scoop out the seeds and some of the flesh, creating little hollow boats. Do not scoop too deep or they will be too thin to hold the filling.

Step 2: Mix the drained tuna with mayo, garlic powder, onion powder, salt, and pepper. Stir in half the cheddar cheese. The mixture should be thick enough to hold its shape when spooned. If it feels too loose, drain the tuna one more time.

Step 3: Arrange the zucchini boats on a baking sheet and fill each one generously with the tuna mixture. Pack it in there. Top with the remaining cheddar and a sprinkle of Parmesan over everything. The Parmesan gets these gorgeous golden crispy bits on top that are honestly the best part.

Step 4: Bake for 18 to 20 minutes until the zucchini is tender and the cheese is bubbly and golden. Quick check at 15 minutes. Every oven is different. Pull them out when the cheese looks deeply golden and your kitchen smells like a dream. Garnish with fresh parsley and serve hot.

7. Keto Tuna Cucumber Bites

Ingredients:

• 1 large English cucumber, sliced into 1/4 inch rounds
• 2 cans (5 oz each) tuna in water, drained
• 3 tablespoons mayonnaise
• 1 tablespoon cream cheese, softened
• 1 teaspoon lemon juice
• Salt and pepper to taste
• 2 tablespoons finely diced radish
• Sriracha or hot sauce for topping

Instructions:

Step 1: Slice your cucumber into even rounds, about a quarter inch thick. Use a paper towel to pat the tops dry so the tuna mixture actually sticks and does not slide right off. This tiny step makes a huge difference. Arrange them all on a serving board or plate.

Step 2: Mix together the drained tuna, mayo, cream cheese, and lemon juice until smooth and creamy. The cream cheese makes this mixture noticeably richer and sturdier than regular tuna salad. Season with salt and pepper and taste it. Yep, that is it.

Step 3: Spoon or pipe a small mound of the tuna mixture onto each cucumber round. You do not need a piping bag. A small spoon works perfectly fine. Just aim for the center and give each one a gentle press so it sits nicely.

Step 4: Top each bite with a small piece of diced radish and a tiny drizzle of sriracha. The radish adds crunch and a mild peppery bite. The hot sauce adds color and heat. These are perfect for parties and honestly so easy to make ahead. I make these every time we have people over.

8. Keto Tuna Stuffed Bell Peppers

Ingredients:

• 3 large bell peppers (orange and yellow work great), halved and seeded
• 2 cans (5 oz each) tuna in water, drained
• 3 tablespoons mayonnaise
• 1 tablespoon cream cheese, softened
• 1 teaspoon garlic powder
• Salt and black pepper to taste
• 3/4 cup shredded Mexican blend cheese
• 3 green onions, sliced for topping

Instructions:

Step 1: Preheat your oven to 375 degrees F. Halve the bell peppers lengthwise and remove the seeds and white membranes. Place them cut side up on a baking sheet. A tip I learned from my mom: rub a tiny bit of olive oil on the outside of each pepper before baking. It keeps them from wrinkling and they come out looking gorgeous.

Step 2: Combine the tuna, mayo, cream cheese, and garlic powder in a bowl. Mix it well until the cream cheese is fully incorporated. Season with salt and pepper. Taste as you go. The cream cheese gives this filling a rich, almost dip-like consistency that holds up beautifully inside the pepper.

Step 3: Spoon the tuna mixture generously into each pepper half, pressing it down lightly so it fills every corner. Top each one with a good handful of shredded cheese. Do not be skimpy here. That melted cheese layer on top is what makes this whole dish feel indulgent and satisfying.

Step 4: Bake for 20 to 25 minutes until the peppers are tender and the cheese is fully melted and bubbly with a few golden spots on top. Scatter sliced green onions over everything right after they come out of the oven. The green onions brighten the whole dish. Let them cool for 5 minutes before eating because that filling is incredibly hot.

9. Tuna Cauliflower Fried Rice

Ingredients:

• 3 cups cauliflower rice (fresh or frozen)
• 2 cans (5 oz each) tuna in water, drained
• 3 tablespoons mayonnaise
• 1 tablespoon sriracha
• 1 tablespoon soy sauce or coconut aminos
• 1 tablespoon sesame oil
• 1 cucumber, sliced into thin rounds
• 2 green onions, thinly sliced
• 1 teaspoon black sesame seeds
• Salt and pepper to taste

Instructions:

Step 1: Cook the cauliflower rice in a dry skillet over medium-high heat for about 5 to 7 minutes, stirring occasionally, until the moisture evaporates and the edges just start to toast slightly. This step is everything. Wet cauliflower rice is mushy and sad. Dry and toasted is nutty and delicious. Do not rush this part.

Step 2: While the cauliflower rice cooks, mix the drained tuna with mayo and sriracha in a separate bowl. This spicy tuna mayo is essentially the star of this dish. Stir until fully combined and taste it. Adjust the sriracha to your heat preference. Too spicy? More mayo. Not spicy enough? You know what to do.

Step 3: Drizzle the sesame oil and soy sauce over the cooked cauliflower rice and toss to coat. The sesame oil makes your kitchen smell like a proper Asian restaurant and honestly I make this just for that smell sometimes. Season lightly with salt and pepper.

Step 4: Divide the cauliflower rice into bowls, spoon the spicy tuna mixture right on top, and add fresh cucumber slices on the side. Finish with sliced green onions and a sprinkle of black sesame seeds. The cucumber keeps everything fresh and cool against the richness of the tuna. Such a good contrast.

10. Cheesy Keto Tuna Melt (No Bread)

Ingredients:

• 2 cans (5 oz each) tuna in water, drained
• 3 tablespoons mayonnaise
• 1 tablespoon Dijon mustard
• 1 stalk celery, finely diced
• 1 tablespoon red onion, minced
• Salt and black pepper to taste
• 1 cup shredded cheddar cheese
• 2 green onions, sliced
• Sriracha mayo for dipping (mix 2 tablespoons mayo with 1 teaspoon sriracha)

Instructions:

Step 1: Preheat your oven broiler to high. Mix together the tuna, mayo, Dijon mustard, celery, and red onion in a bowl. Season with salt and pepper. This tuna base is already something you could eat straight from the bowl. I have done that. Multiple times. No regrets.

Step 2: Line a small baking sheet with parchment paper. Divide the tuna mixture into two oval mounds directly on the baking sheet, pressing each one down gently so they are about a half inch thick. Think of these like breadless tuna patties. They will hold their shape once the cheese melts over them.

Step 3: Top each tuna mound generously with shredded cheddar cheese. Cover the whole surface so every edge gets that melty cheese coverage. Slide the baking sheet under the broiler and watch it closely. This step goes fast. 3 to 4 minutes is usually all it takes. I have burned these by walking away, so stay close.

Step 4: Pull them out when the cheese is fully melted, bubbling, and getting those gorgeous golden brown spots on top. Scatter sliced green onions over the top immediately. Serve with the sriracha mayo on the side for dipping. This is easier than it sounds, better than anything from a drive-through, and completely keto. Right?

Final Thoughts

There you have it. Ten ways to turn a humble can of tuna into something you actually look forward to eating. These recipes are simple, satisfying, and totally low carb. Start with whichever one sounds best to you today and work your way through the list. Drop a comment and tell me which one became your favorite. I read every single one.