BBQ Beef Burgers Grill RecipesMushroom & Caramelized Onion American Wagyu Cheeseburgers Tony ZentgrafSeptember 4, 2023February 20, 2023 Leave a Comment on Mushroom & Caramelized Onion American Wagyu Cheeseburgers This burger was amazing! The caramelized onions and mushrooms were seared with garlic confit oil. The patties being an American Wagyu Ground Beef provided a …