1 lb ground beef
Shredded cheese (I prefer sharp cheddar)
Diced onion
Mushrooms
Steak sauce
Whatever seasoning you want

Make a hamburger patty. Make a whole in it. Shove cheese, onion, and mushrooms inside. Close em up. Season patty and put steak sauce on top. Cook thoroughly on grill. Enjoy
 
 
Fresh ground meat
Onion, finely minced/chopped
Pepper
Worcestershire sauce

Mix em all together so it's internal too. Put on your grill and cook thoroughly. Add cheese, whatever you want. Enjoy