a little vegetable oil or cooking spray, to prepare the grill pan 8 slice of your favorite burger cheese (optional) 8 Tbsp relish 8 sweet sandwich pickles 4
oz baby lettuce 4
oz alfalfa sprouts 1 avocado, cut into slices (optional) 8 whole wheat poppy seed
buns, toasted
2 tablespoons extra-virgin olive oil 8
oz (250 g) mushrooms, sliced 1 clove garlic, minced 1 lb (500 g) lean ground beef, 90 percent 1 tablespoon Worcestershire sauce 1 large egg, beaten with a fork Salt and freshly ground pepper4 whole - wheat burger
buns Sautéed onions for serving
Baby spinach leaves for serving 4 slices of part - skim mozzarella cheese (optional)