Grilled Fish with Charred Onions

Grilled Fish with Charred Onions

Season fish cavity and skin with salt; drizzle with ¼ cup oil. Grill, resisting the urge to turn, until skin is lightly charred and flesh is flaky and opaque down to the bone, about 3 minutes for mullet and 8 minutes for snapper. Place a metal spatula underneath fish, then lift and gently roll over onto the other side. Cook until flesh is flaky and opaque, 3–8 minutes, depending on fish. If a small knife slides easily through the thickest part of flesh, fish is done.