Gorgeous ahi tuna tacos, seared with sesame seeds and finished with a bright citrus mango guacamole. These tacos balance the rich, meaty texture of ahi tuna with fresh, vibrant toppings and warm tortillas for an easy, restaurant-quality meal at home.
Serve these tacos with fresh cilantro, a squeeze of lime, and a scoop of mango guacamole for a bright, tropical contrast to the savory tuna. They make a perfect weeknight dinner or an impressive dish for guests.
Super Simple Ahi Tuna Tacos
We love tacos in every form — beef, chicken, fish, vegetarian — and seared ahi tuna adds a fresh, elegant twist. A quick marinade, a fast hot sear, and simple fresh toppings transform sushi-grade tuna into a sensational taco filling. The combination of sesame seeds, soy-ginger marinade, and a cooling mango-avocado guacamole is both satisfying and bright.
Tips for Perfectly Seared Ahi Tuna
Marinate for flavor: Let the tuna sit in the soy-ginger marinade for at least 30 minutes to develop flavor; two hours yields deeper taste without compromising texture.
High heat and a little oil: Use a hot skillet and a couple of tablespoons of oil to get a quick sear. The goal is to brown the exterior while keeping the center rare to medium-rare so the tuna stays tender and moist.
Slice thinly: After searing, slice the tuna thinly against the grain. Thin slices make it easy to assemble tacos and let each bite combine tuna, avocado, mango, and fresh herbs.
How long to sear ahi tuna?
- Rare: 30 seconds per side
- Medium-rare: 1 minute per side
- Well-done: 2 minutes per side
Fresh Toppings for These Tuna Tacos
Mango guacamole: A mix of ripe avocado, diced mango, fresh lime juice, and cilantro adds creaminess, sweetness, and acidity that complements the savory tuna beautifully.
Other fresh toppings: Keep the toppings simple to let the tuna shine. Chop fresh cilantro and red onion and finish with a squeeze of lime. These elements add brightness and texture.
- Fresh cilantro
- Minced red onion
- Fresh lime juice
All About the Tortilla
The tortilla matters. Choose a “street taco” size that will let you pile on tuna and toppings without overwhelming the bite. Flour or corn tortillas both work well; use what you prefer.
Warm and slightly browned: Before serving, warm the tortillas and brown them a touch. Pan-frying briefly or holding them over a gas flame will add aroma and a little crispness that improves texture and keeps the taco from becoming soggy.
More taco recipe ideas and variations: try these at home for different proteins or vegetarian options — fish, shrimp, beef, or plant-based fillings all pair well with fresh salsas and guacamoles.
Ahi Tuna Tacos
Seared sesame ahi tuna tacos topped with citrusy mango guacamole, cilantro, red onion, and fresh lime — an easy, flavorful recipe that serves 4.
Author: Lee Funke
Prep: 45 mins • Cook: 10 mins • Total: 55 mins • Servings: 4
Ingredients
Mango Guacamole
- 4 medium avocados, ripe
- 2 tablespoons fresh cilantro, minced
- 2 tablespoons fresh lime juice, divided
- 1/2 teaspoon salt, or more to taste
- 1 cup fresh mango, cubed
Seared Ahi Tuna
- 1.5 lbs ahi tuna steaks (about two 1.5-inch steaks)
- 1/3 cup soy sauce
- 1 teaspoon red chili sauce
- 1 teaspoon fresh grated ginger
- 4 tablespoons sesame seeds
- 4 tablespoons olive oil
Other
- 1/4 cup chopped cilantro
- 1/4 cup minced red onion
- 8–12 street taco flour tortillas
Instructions
- Prepare the mango guacamole: mash the avocados and combine with minced cilantro, 1 tablespoon lime juice, salt, and the cubed mango. Stir gently to preserve mango pieces. Set aside and keep chilled until serving.
- Make the marinade for the tuna: in a medium container combine soy sauce, red chili sauce, grated ginger, and the remaining lime juice. Add the ahi tuna steaks and turn to coat both sides. Refrigerate and let the tuna marinate for at least 30 minutes.
- After marinating, remove the tuna from the liquid and press sesame seeds onto all sides so the steaks are evenly coated.
- Heat a large skillet over medium-high heat with 2 tablespoons olive oil. Once the oil is hot and fragrant, add a tuna steak and sear according to desired doneness: about 30 seconds per side for rare, 1 minute per side for medium-rare, or up to 2 minutes per side for well-done. Repeat for the second steak, adding more oil if needed.
- Transfer the seared tuna to a cutting board and let it rest briefly. Slice the tuna into thin strips against the grain.
- To assemble tacos: warm and slightly brown tortillas, then distribute sliced tuna evenly among them. Top with chopped cilantro, red onion, and 1–2 tablespoons of mango guacamole per taco. Finish with an extra squeeze of lime if desired.
Tips & Notes
- For best texture, use sushi- or sashimi-grade ahi tuna if you plan to keep the center rare.
- Adjust searing times to your preference; tuna cooks quickly and becomes dry if overcooked.
- This recipe was updated on February 25, 2020. Nutrition below is approximate and does not include mango guacamole unless noted.
Nutrition (approximate per serving)
- Calories: 396 kcal
- Carbohydrates: 29 g
- Protein: 34 g
- Fat: 17 g
- Fiber: 2 g
- Sugar: 3 g
Nutrition information is automatically calculated and should be used as an approximation.
If you try these ahi tuna tacos, garnish them simply and enjoy the contrast of hot, savory tuna with cool, fruity guacamole. They’re an elegant yet easy way to enjoy sushi-grade fish in a casual taco format. Tag your photos and share how you made them — small changes like adding pickled red onion or a drizzle of sriracha mayo can be delicious variations.