How to Make It
Season the yellowtail all over with salt and let stand for 15 minutes, then pat dry with paper towels.
Preheat the broiler and position the rack 8 to 10 inches from the heat. Season the yellowtail collars lightly with salt and arrange skin side up on a large rimmed baking sheet. Broil for about 10 minutes, until the skin is lightly charred. Flip the collars and broil for 10 minutes longer, until the meat flakes with a fork.
Meanwhile, in a small bowl, whisk the soy sauce with the lemon juice and sugar.
Transfer the collars to a platter and pile the daikon alongside. Drizzle some of the lemon soy sauce over the daikon and serve, passing additional lemon soy sauce at the table.