– 4 Beyond Meat patties – 4 slices cheese – 4 buns – lettuce – 1 large tomato sliced – 2 pickled cucumbers sliced For the Sauce – 3 tablespoons mayo – 3 tablespoons ketchup more for garnish – 1 teaspoon horseradish or to taste For Sauteed Mushrooms – 2 tablespoons butter – 1 medium red onion sliced, more for garnish – 8 oz bella mushrooms sliced – 1 clove garlic – 2 teaspoons soy sauce or to taste – ground black pepper to taste