The rich flavors of caramelized onions and mushrooms, along with Swiss cheese and a tangy mayo-mustard spread, make this recipe's burger even better.
Ingredients: 4 burger buns. 1 large onion, thinly sliced. 2 cups sliced mushrooms such as cremini or button. 4 burger patties beef, turkey, or plant-based. 4 slices Swiss cheese optional. 2 tablespoons olive oil. Salt and pepper to taste. 1 tablespoon balsamic vinegar. 2 tablespoons mayonnaise. 1 tablespoon Dijon mustard. 1 cup baby spinach leaves.
Instructions: Set a pan on medium heat and add the olive oil. Slice the onions and mushrooms and add them to the pan. To make caramel, cook, stirring every now and then, for about 15 to 20 minutes. Put some salt and pepper on it, and then drizzle some balsamic vinegar over it. Mix it all together, then take it off the heat. You can grill or cook the burger patties however you like, and you can add Swiss cheese slices to melt in the last minute if you want to. Both a grill and a toaster can be used to toast burger buns. Put mayonnaise and Dijon mustard in a small bowl and mix them together. Spread the mayo-mustard mix on the bottom half of each bun before putting the burgers together. A burger patty, a mixture of caramelized onions and mushrooms, and a bunch of baby spinach leaves should be put on top. Cover the filling with the top half of the bun and serve right away.
Gia