Sicilian Burgers

My family enjoyed the unique flavor of these burgers. They're also good reheated as leftovers.

1-3/4 pounds ground beef
1 cup chopped onion (use to your liking)
1-1/4 cups ketchup
1/4 cup dill relish
1/2 teaspoon salt
1/4 teaspoon dried basil
1/8 teaspoon pepper
1-1/2 cups (6 ounces) shredded process cheese
Hamburger Buns

Brown beef and onion in a skillet. Drain fat. Remove from the heat; stir in ketchup, relish, salt, basil and pepper and mix well. Stir in cheese. Spread meat mixture onto buns. Wrap sandwiches individually in foil and place in a baking pan. Heat at 325 for 20 minutes.