Mexican
Whisk sour cream, mayonnaise, juice of half a lime, and a pinch of salt into a smooth crema; chill until serving.
Toss shredded cabbage with a squeeze of lime and a pinch of salt to lightly wilt it.
Pat the fish dry, rub with olive oil, then season with chili powder, cumin, garlic powder, salt, and pepper.
Sear the fish in a hot pan for 3 to 4 minutes per side until opaque and lightly charred, then break into chunks.
Warm the tortillas in a dry skillet until soft and pliable.
Fill each tortilla with fish, top with cabbage, drizzle with lime crema, and scatter cilantro.
Serve with extra lime wedges on the side.