Grilled Mushroom Swiss Burger Recipe

Ingredients

• 1 pound ground beef (for juicy burgers, 80/20 is good)
• 1 ounce dried mushrooms, such as porcinis or morels
• 2 teaspoons Worcestershire sauce
• 1/2 teaspoon kosher salt, or more to taste
• 1/2 teaspoon freshly ground black pepper
• 1/2 pound fresh shiitake mushrooms, stemmed and sliced
• 1 large onion, thinly sliced
• 2 tablespoons extra virgin olive oil
• Kosher salt
• 4 to 6 slices Swiss cheese
• Burger buns