Created by Marramamba on March 15, 2015
Step 1: Preheat broiler with oven rack about 6 inches from direct heat source.
Step 2: Preheat oil in a small skillet set over medium heat. Add mushrooms, garlic and salt and cook until mushrooms have released their liquid and turned golden brown, 5 minutes. Set aside to cool.
Step 3: In a medium bowl combine sirloin, scallion, soy sauce, pepper and cooled mushrooms and mix lightly.
Step 4: Form into a patty and place on a broiler pan.
Step 5: Broil until cooked to desired doneness, 3 minutes on each side for medium, and top with Swiss cheese while hot.
Step 6: Spread each side of the bun with mustard, top with lettuce, tomato and the burger.