Chesapeake Bay Soft-shell Crab “Sandwich”

This is not really a sandwich, of course, but the dish was inspired by my love of traditional soft-shell crab sandwiches heaped with tomatoes and tartar sauce. I’ve refashioned the ingredients of a classic tartar sauce—egg yolks, dill pickles, capers—as hard-boiled yolks, Dijon mustard, and cornichons. On top of the sauce, I put a crouton, then the crab, trimmed down to just its body and claws, then tomato confit, arugula, and fried capers.