Umami Mushroom Patty Melt - JFC International

Ingredients

• 1 pound ground beef
• ¼ cup finely diced onion
• 4 tsp. Dynasty Oyster Sauce
• 1 Tbsp. olive oil, divided
• ¼ tsp. freshly ground black pepper, divided
• 10 ounces mushrooms, such as cremini mushrooms or baby bella, sliced
• ½ cup thinly sliced onions
• 1 ½ teaspoons all-purpose flour
• ¼ cup dark lager beer
• 4 Tbsp. butter, softened
• 8 slices rye bread
• 4 slices provolone cheese