Prepare the salad ingredients: Chop 3 tomatoes, a piece of onion, 6 puulla chilies, a handful of chile de árbol, and 1 garlic clove for the salad.
Toast and prepare chilies for sauce: Toast the chile de árbol and 3 additional chilies lightly, removing some seeds to reduce heat. Combine toasted chilies with onion and garlic clove and cook until well done.
Prepare tuna cooking ingredients: Chop half an onion (medium size), grate 2 carrots, chop 2 tomatoes, and 1 serrano chili for cooking the tuna.
Cook the tuna filling: In a pan with oil, fry the chopped onion, grated carrots, chopped tomatoes, and serrano chili with salt. Add the tuna and fry until well cooked and flavorful.
Make the chili-tomato sauce: Grind the toasted chilies, onion, and garlic with a little salt and minimal water to avoid watery sauce.
Assemble the tacos: Place Oaxaca cheese inside the tortilla, add the fried tuna filling, and roll up the taco.
Fry the tacos: Heat oil in a pot and fry the rolled tacos until golden brown. Drain excess oil.
Serve: Top the tacos with cream, disinfected lettuce, fresh cheese, and the prepared chili-tomato sauce. Serve immediately.