Dice the fresh tuna fillet into small pieces.
In a bowl, combine soy sauce, lime juice, olive oil, cumin, salt, and pepper.
Marinate the tuna pieces in the mixture for 15-20 minutes.
Chop the onion, chili, cilantro, tomatoes, and avocado.
In a hot skillet, sear the tuna pieces for 1-2 minutes on each side, until lightly seared but still juicy inside.
Warm the tortillas in a dry skillet or directly over a flame until slightly toasted.
Fill the tortillas with the seared tuna, then sprinkle with fresh cilantro, chopped onion, and avocado.
Squeeze fresh lime juice over the tacos before serving to enhance the flavors.
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