Snapper en Mornay was one of the most popular dishes at the old Warehouse in Oxford. We broiled snapper fillets with a rich in-house sauce, and served them with a dusting of paprika, a sprinkling of sliced almonds, and our house bread.
Make a blond roux using a half cup each butter and flour. Add two cups whole milk, a splash of good sherry, a teaspoon of salt, and a cup of grated cheese (Parmesan, Romano, or a dry Swiss). This makes a very thick, rich white sauce to which you can add picked lump crab meat or chopped cooked shrimp/green onions.
Mix well, and chill thoroughly. This makes a little over three cups of sauce, enough for five, maybe six 8-ounce fillets of snapper, flounder, red fish, catfish, or another lean white fish. Score fillets on the bone side (this is important). Place in a lightly oiled sizzle platter, cover with (cold) sauce, and place in a very hot (450) oven–I don’t recommend broiling–until fish flakes, about 7 or 8 minutes.
