Mushroom and Beef Burger

Name: Mushroom and Beef Burger
Prep time: 15 min
Cook time: 1 h
Total time: 1 h
Yield: 6 portions
Ingredients: 8 oz fresh shiitake mushrooms; 2 oz fresh portobello mushrooms; 4 oz fresh king oyster mushrooms; 2 oz fresh Swiss brown mushrooms; 16 oz ground beef; 2 large eggs; 2 oz dried bread crumbs; 1 oz liquid aminos, e.g. Bragg®; 2 tsp Worcestershire sauce; 1 tsp freshly ground black pepper; 6 slices white cheddar cheese; 6 hamburger buns