Tangy blue cheese, sautéed mushrooms and caramelized onions, and a tangy lemon garlic aioli make these juicy homemade hamburgers incredibly delicious. Follow this easy recipe and enjoy the flavors of a grilled Red Robin Copycat Black and Bleu Burger at home.
In a large skillet over medium heat, place the oil, onions, and mushrooms. Stir occasionally to prevent them from browning too much. Once the onions have been caramelized*, remove them from the heat.
Mix the ground beef, garlic powder, salt, and pepper in a large mixing bowl using your hands. Divide the hamburger mixture evenly into six balls, press each into a patty. Use your thumb to make an indent in the middle of the patties to allow the middle to cook more evenly.
Place the burgers on the pre-heated grill and cover. Cook for 3 minutes on each side, then remove the burgers from the grill. Place the cooked burgers in a container with a lid for 2 minutes to allow the meat to rest and absorb its juices.
To assemble the burgers, place the arugula on the bottom of the buns, then the burgers, and top with the onion mixture and 2½ ounces of blue cheese. Spread a spoonful of garlic aioli onto the top of each bun and place it on the burger.
Notes
*You will know that the onions are caramelized because they will be soft and slightly browned. If you're in a hurry, you could use the onions when they are soft and translucent, but they will be much tastier and sweeter if you cook them past that stage, until they have browned a bit.You can find the recipe for lemon garlic aioli here. If you prefer not to make it, you could substitute with plain mayonnaise.