The BEST homemade Patty Melt recipe is cooked on two slices of sourdough bread with cheese, caramelized onions, and a quick sauce. It all comes together beautifully for a truly remarkable sandwich.
Burger Sauce: Add sauce ingredients in a bowl and mix to combine. Set aside.
Caramelize Onions: Heat a cast iron skillet over medium heat. Add 1 Tablespoon butter and 1 Tablespoon oil and once melted, add onions then season with salt and pepper. Cook, stirring frequently, until golden brown and caramelized, about 20 - 25 minutes. Add a splash of water as needed, if the onions seem to be drying out. Remove to plate and set aside.
Form Burger Patties: Divide meat into five patties (4.8 oz each) and shape each into thin patties, roughly the same shape as the bread slices. Handle the meat as little as possible. Season patties generously on both sides with salt and pepper.
Cook Patties: Heat a flat-top griddle or cast iron pan over medium-high heat. Grease with 1 tablespoon oil. Add burger patties and cook for 3-4 minutes, flipping once, until medium-rare (I like to cook them to medium rare/slightly pink inside, as they will cook more as they rest, and in the patty melt). Remove to plate to rest.
Assemble Patty Melts: Wipe griddle/pan clean. Reduce pan heat to medium-low. Butter one side of each piece of bread. Place buttered side of bread face down in hot pan. Top with a slice of cheese, beef patty, a spoonful of onions, drizzle of burger sauce, another slice of cheese, and top slice of bread (butter side facing up). Cook for a few minutes, until bread is toasted on the bottom. Gently flip and cook on opposite side until golden, and cheese is melted.
Serve with leftover burger sauce for dipping, if desired.
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Notes
Nutritional info does not include burger sauce.Sourdough Bread: I like to buy square loaf sourdough—1.5lb loaf with about 12 slices.Make Ahead Instructions: The sauce can be made ahead of time and kept in the fridge until ready to assemble the homemade patty melt. The caramelized onions could also be cooked 1-2 days ahead, and reheated for a few seconds before serving.