MUSHROOM STUFFED BURGERS

Steps:

• In a medium bowl, gently mix together the beef, soy sauce, 3/4 tsp of the pepper, 1/2 tsp of the salt.
• Using generous 1/3 cup per patty, shape mixture into 8 (4 1/2-inch) patties 3/8 inch thick.
• Refrigerate while preparing the stuffing.
• Heat a large nonstick skillet over medium high heat until hot.
• Add the butter and oil.
• Heat until hot and butter is melted.
• Add the mushrooms and cook for 2 min, stirring occasionally.
• Add the garlic and cook for 8-10 min or until the mushrooms are browned and the liquid has evaporated.
• Stir in the green onions, Worcestershire sauce, remaining 1/2 tsp pepper and remaining 1/4 tsp salt.
• Let cool.
• Mound about 1/2 cup of the stuffing in the center of 4 of the patties.
• Cover with the remaining 4 patties, sealing the edges firmly by pressing together with your fingers.
• Gently press the center of the burgers to eliminate mounding.
• Heat the grill or grill pan to medium heat.
• Grill for 5-6 minute.
• Flip the burgers and grill for 5-6 min more, or until no longer pink in the center.
• Top each burger with 1 slice of cheese, and grill for another min or so - until the cheese has melted.
• Meanwhile, in a small bowl, whisk together all of the mayonnaise ingredients.
• Place the buns on the grill, split side down, and grill for 30-60 sec or until lightly toasted.
• Spread each bun with 2 Tbs of the mayonnaise.
• Top with a burger and a tomato slice.