Cut the fish fillets into thin strips. White fish can be pangasius, cod, grouper, etc.
Place fish strips in a shallow dish, pour beer over fish. Marinate 15-30 minutes then drain and discard beer.
Heat the oil in a non stick pan on medium heat. In another shallow dish, add the cornmeal, chili powder, and salt, mix together.
Coat fish strips with the cornmeal mixture, add fish to the pan but do not overcrowd.
Fry 3-4 minutes per side or until fish flakes easily with a fork and is golden brown.
Divide fish strips among the tortillas.
top each tortilla with cabbage and tomatoes. Squeeze some lime juice over each tortilla.
Serve with a lime wedge on the side. Enjoy.