This Keto Tuna Ceviche is a refreshing, vibrant lunch option that brings a burst of coastal flavor to your kitchen without any actual cooking. It features a delightful contrast of textures, combining the meaty flakes of canned tuna with the buttery smoothness of ripe avocado and the crisp bite of red onions and jalapeños. The lime juice provides a bright, zesty acidity that perfectly balances the rich olive oil, while the fresh cilantro and tomatoes add a garden-fresh finish that makes every bite feel light yet incredibly satisfying. It is the ultimate quick-fix meal for those busy afternoons when you want something gourmet but only have ten minutes to spare.

One of the best things about this recipe is how easily it can be adapted to suit your pantry or specific carb goals. If you aren’t a fan of heat, you can easily swap the jalapeño for diced green bell pepper or simply omit it for a milder profile. For those looking to lower the carb count even further, replacing the tomatoes with diced cucumber adds an extra crunch while keeping the refreshing vibe intact. You can also experiment with different proteins; while canned tuna is a convenient staple, canned salmon or even cooked shrimp work beautifully with these same bright, citrusy flavors. Serving this in crisp romaine lettuce leaves or over a bed of shredded cabbage adds a wonderful crunch without the need for traditional high-carb chips.

Because this dish relies on fresh lime juice and delicate avocado, it is best enjoyed immediately to appreciate the vibrant colors and firm textures. If you do have leftovers, you can store them in an airtight container in the refrigerator for up to twenty-four hours, though keep in mind that the acid in the lime juice may soften the vegetables over time. To keep the avocado from browning, you can press a piece of plastic wrap directly onto the surface of the mixture before sealing the lid. This recipe is not suitable for freezing, as the fresh produce and tuna will lose their structural integrity upon thawing. When you are ready for your second serving, there is no need for reheating—simply give it a gentle stir and enjoy it chilled right from the fridge for a crisp and cooling meal.

Yields 2 servings of Keto Tuna Ceviche

The Preparation

7 ounces canned tuna, drained
1/2 medium avocado, sliced
1/2 cup fresh tomatoes, diced
2 tablespoons fresh cilantro, chopped
2 tablespoons red onion, chopped
1 medium jalapeno pepper, seeded and diced
1/2 tablespoon lime juice
1/2 teaspoon olive oil
1/8 teaspoon cumin
salt and pepper, to taste

The Execution

1. Combine all of the ingredients except the tomatoes and avocado slices in a bowl and mix well. Gently toss with tomato and avocado. Serve with lettuce leaves if you’d like!

Tuna ceviche tossed with avocado, cherry tomatoes, red onion, cilantro, and lime wedges

This makes a total of 2 servings of Keto Tuna Ceviche. Each serving comes out to be 228 calories, 11.2g fats, 3.5g net carbs, and 24.9g protein.

NUTRITION	CALORIES	FAT	CARBS	FIBER	NET CARBS	PROTEIN
7 ounce canned tuna	254	5.9	0	0	0	46.9
1/2 medium avocado	150	13.9	7.8	6.1	1.7	1.8
1/2 cup fresh tomatoes	15	0.2	3.2	1	2.2	0.7
2 tablespoon fresh cilantro	0	0	0.1	0.1	0	0
2 tablespoon red onion	9	0	2	0.3	1.8	0.3
1 medium jalapeno pepper	4	0.1	1	0.4	0.6	0.1
1/2 tablespoon lime juice	2	0	0.6	0	0.6	0
1/2 teaspoon olive oil	20	2.3	0	0	0	0
1/8 teaspoon cumin	1	0.1	0.1	0	0.1	0.1
— salt and pepper	0	0	0	0	0	0
Totals	456	22.4	14.8	7.9	6.9	49.9
Per Serving (/2)	228	11.2	7.4	4	3.5	24.9