In a large bowl, mix together the ground beef, Worcestershire sauce, hickory seasoning, salt and pepper until well blended. Make 20 balls, and flatten into patties. On one half of the patties, distribute the onions, mushrooms, ham and cheese. Carefully cover the piles with the remaining patties, making sure to seal all of the edges of the patties together tightly and enclose the filling.
5 pounds lean ground beef, 6 tablespoons Worcestershire sauce, 2 teaspoons hickory seasoning (Optional), salt and pepper to taste, 2 cups chopped onion, 2 cups chopped fresh mushrooms, 2 cups chopped cooked ham, 3 cups shredded Cheddar cheese