Note: Asadero is one of several Mexican cheeses made fresh from part-skim milk -- the Mexican equivalent of mozzarella. Like mozzarella, asadero (along with fresco, panela, an quesadilla cheese) has an equal fat-to-protein ratio. But unlike mozz, these cheeses have an extremely low "melting" temperature, but do not run or separate, or even lose their shape, really; they just get hot and very soft. Also, asadero has a deeper, nuttier flavor than mozzarella.
salt and pepper
6-inch corn tortillas
asadero cheese, sliced or grated
salsa/hot sauce/chilis, green or red
ripe mango, diced
lettuce or cabbage, sliced into ribbons
Heat a little oil (about half a teaspoon per fillet) in nonstick pan over medium. While it heats, prepare the other ingredients. Pat tilapia dry with paper towel and set in hot pan. Season with salt and pepper. Let it cook several minutes, until thin side of fillet is almost opaque throughout (it's hard to overcook tilapia, and you want both sides to brown nicely). Meanwhile, continue preparing other ingredients. Flip tilapia and continue cooking. When done, remove from pan, turn heat to medium-low, set fish aside on cutting board or plate and drench fillets with lime juice. Add a little oil to the pan if needed and heat the tortillas on one side, flipping them over after a minute or so and sprinkling hot side with cheese, cilantro, and salsa/hot sauce. When cheese is melted, remove tortillas to plate, add tilapia, mango, sour cream, and lettuce. Wrap up and enjoy.