Scotch Eggs

1 egg, beaten

1 teaspoon Dijon mustard
½ cup (2½ ounces) unbleached flour
1 pound bulk sausage
2 cups breadcrumbs, either panko or fresh
5 eggs, hard-boiled and peeled
vegetable or peanut oil for frying

Mix egg and mustard in a medium bowl to blend. Place flour in another bowl. Place breadcrumbs in another bowl. Roll 1 hard-boiled egg in flour. Using wet hands, press 1/5 of sausage around egg to coat. Roll sausage-covered egg in beaten egg mixture, then roll in breadcrumbs, covering completely and pressing to adhere. Place Scotch egg on plate. Repeat with remaining eggs. (Can be made 1 day ahead. Cover and refrigerate.)

Add enough oil to heavy large saucepan to reach depth of 1½ inches. Attach deep-fry thermometer and heat oil to 360-370 °F. Add 3 prepared eggs to oil; fry until sausage is cooked through and coating is deep brown, about 6 minutes. Using slotted spoon, transfer eggs to paper towels to drain. Repeat with remaining 2 eggs. Serve warm.