There’s something exceptionally awesome about the combination of a smashed beef patty, bechamel sauce, cheddar cheese, caramelized onions and spicy mustard on griddled bread.
To balance the richness of the meat – not to say anything of the bechamel, grated cheese and caramelized onions that further gild the lily – slather some spicy mustard on two slices of buttered bread.
5 tablespoons unsalted butter
4 tablespoons unsalted butter, softened
¾ cup grated cheddar cheese
When the butter has melted add the onions, reduce the heat to medium-low and cook, stirring occasionally, until the onions are caramelized and a deep golden brown, 30-45 minutes.
Make the sandwiches by buttering one side of each of the slices of bread and placing them on a rimmed baking sheet, buttered side-down.
When hot, place the baking sheet holding the bread slices under the broiler, 3 inches from the heating element, and broil until the cheese melts, about 3 minutes.
Per serving: 812 calories, 35 g protein, 34 g carbohydrates, 60 g fat (34 g saturated), 201 mg cholesterol, 709 mg sodium, 3 g fiber.