1 large potato, peeled and shredded
2 pounds lean ground beef
1 cup shredded Swiss cheese
1 cup chopped fresh mushrooms
2 (1-ounce) packages dry onion soup mix
Preheat grill for high heat.
In a medium bowl, mix together potato, cheese and mushrooms.
In a large bowl, mix ground beef with onion soup mix. Form into 6 large burger patties. Make a pocket in each burger, stuff with potato mixture and seal.
When ready to grill, brush grate with oil. Cook burgers over high heat for 5 minutes on each side or until well done.