Seared Ahi Tuna Tostadas are one of my favorite recipes when I need a good dose of deliciousness. I prepared a pineapple salsa with a creamy avocado paste and topped them with fresh cilantro. All of the flavors are balanced and pleasant to enhance the tuna for a wonderful meal.

ahi tuna tostadasThe Ahi, or Yellowfin, Tuna is sushi grade tuna that is extremely rich in nutrition. Yes, you can eat this Tuna raw, but I love to give it a quick sear of 45-60 seconds on each side for the tasty crust.

I get my cast iron (or a flat surface) blazing hot at around 550 degrees for this. I like to use my induction stovetop with my carbon steel pan, it does the job nicely.

ahi tuna recipe

Seared Ahi Tuna Tostadas

Prep Time 1 hr
Cook Time 3 mins
Total Time 1 hr 3 mins
Course Appetizer
Cuisine American
Servings 4


  • 2 Yellowfin Tuna steaks sushi grade
  • 1 Pack of yellow corn tortillas
  • 1 cup Neutral oil for frying
  • Cilantro for garnishing

Honey Soy Marinade

  • ¼ cup Soy sauce
  • 1 tbsp Honey
  • 1 tbsp Rice wine vinegar
  • 2 tsp Toasted sesame seed oil
  • 2 tsp Mirin
  • 1 tsp Fish sauce
  • 1 tsp Kosher salt
  • ½ tsp Black pepper
  • ½ tsp Cayenne pepper

Pineapple Salsa

  • ¾ Whole pineapple cored and cut into ¼“ cubes
  • ½ Red onion diced
  • 1 Whole fresno pepper seeded and diced
  • ½ Lime juiced
  • 1 tsp Kosher salt

Creamy Avocado Paste

  • Avocados
  • ½ Lime juiced
  • 1 Pinch of salt to taste


  • Start off by prepping all of your ingredients for the Honey Soy Marinade. Get all of it properly portioned and then place your Yellowfin tuna steaks in a zip lock bag. Combine all of the marinade ingredients into a mixing bowl and whisk for a minute or two. You want those flavors to be combined to maximize the flavors. Now, pour the marinade into the zip lock bag with the tuna steaks, seal the bag where it is airtight and then mix the tuna with the marinade. Place in the fridge for a minimum of 1 hour.
  • While the tuna steaks are marinating I like to prepare my Pineapple salsa. I begin by removing the skin from my pineapple and then cutting them into slices. From here I remove the core and dice my pineapple, placing them into the mixing bowl. Now, I go straight into my red onion and dice, placing them into the bowl with the pineapple. Cut into the Fresno pepper and remove the seeds and veins. Dice them and place in the mixing bowl. From here squeeze your lime juice and salt to taste. Mix for a bit with a wooden spoon and then place in the fridge.
  • 45 mins into the tuna steaks being marinated begin making your avocado paste. Cut your avocado in halves (long ways) and then remove the seed. Now squeeze the avocado into a mixing bowl. Add lime juice and salt, followed by a fork to mash the avocado into a nice consistent paste. Place this in the fridge.
  • Heat up a cast iron skillet and add the cooking oil. Heat to 375 and then add your corn tortillas, be sure to do this in batches so you don’t overcrowd the skillet. Fry for 60 seconds and flip, fry an additional 30-45 seconds. Be sure to make sure they are lightly browned and solid like a chip. Place all of them in aluminum foil and then seal.
  • You can remove the hot oil at this point or use a different cooking surface but begin to warm up a flat cast iron, or carbon steel griddle area. Get your Tuna steaks out of the marinade and let sit for 10 mins, now be sure to pat dry with a paper towel. 
  • Once the cooking surface reaches 525-550 degrees you are ready for searing. Add the tuna steaks and sear for 60 seconds, flip and repeat the process. Remove and let rest for 5 mins and the slice them into 1/4” thick strips and then cube them into 1/4” cubes (ideally).
  • Build your tostada by placing the crispy tortilla on the cutting board and adding the avocado paste, be sure to spread it like butter (a nice even thick spread) then add the cubed tuna steaks, top with the pineapple salsa and garnish with fresh cilantro. Repeat until you make the appropriate amount for lunch.
  • Serve and enjoy with family and friends!
Keyword Ahi tuna, ahi tuna tostadas, easy tostadas, tostadas, tun steaks

So, if you’re in the mood for a delicious seafood dish that is both easy to make and impressive enough to serve to guests, give seared ahi tuna tostadas a try. With just a few simple ingredients and minimal preparation time, you can have this tasty dish on your table in no time at all. And who knows – once you’ve tried it, you may just find yourself making these tostadas often!

Did you enjoy this Ahi Tuna Tostadas recipe? Youll love my other fish recipes in the link below!

Fish Recipes

Items used in This Recipe

Hasty-Bake Grill

Knitted Gloves

Food Processor

Cast Iron Skillet 

Meater +

Charcoal Chimney

Charcoal Starters

Firestarter Guard

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