Preheat your grill to medium-high.
In a bowl, combine the ground beef, and egg and season with salt and pepper to taste.
1 lb. ground beef, 1 egg, Sea salt and freshly ground black pepper
Shape the ground beef into 4 large patties.
1 lb. ground beef
Rub the portobello mushroom with oil and season to taste.
8 portobello mushrooms, 2 tbsp. olive oil, Sea salt and freshly ground black pepper
Grill the burgers, covered, for 4 to 7 minutes on each side.
Grill the portobello mushroom for 4 to 6 minutes on each side at the same time.
Serve the burger on portobello mushrooms topped with bacon, ketchup, tomato, onion, and lettuce.
8 bacon strips, 4 tomato slices, 4 onion slices, Fresh lettuce, Homemade ketchup