Sauerbraten Burgers

1/2 cup (8 cookies) crushed gingersnaps, divided
1 (8 ounce) can tomato sauce
1/4 cup onion, minced
1/2 teaspoon salt
1 pound ground beef
2 tablespoons brown sugar
2 tablespoons vinegar
2 tablespoons water
1 teaspoon prepared mustard
Dash of black pepper

Reserve 2 tablespoons gingersnaps. Combine remaining gingersnaps, 2 tablespoons tomato sauce, onion and salt. Add meat and mix well. Shape into 4 half-inch thick patties.

Heat grill to medium/high. Place patties on grill. Put sauce on side burner and heat till slightly bubbly. When patties are nearly done, spoon a small amount of sauce on tops and heat for a minute or two. Sprinkle remaining gingersnaps on patties after removing from grill.