Instructions

  1. To make relish: add the relish ingredients to the container of a food processor; cover and pulse until coarsely chopped; cover and chill for 2-3 hours.
  2. To make burgers: stir together the onion, bread crumbs, and bell pepper in a mixing bowl.
  3. Add the ketchup, horseradish, mustard, salt and pepper to taste; stir to mix.
  4. Add the ground beef; stir to mix.
  5. Shape mixture into 4 patties.
  6. Grill patties over medium heat for 7 minutes; turn and grill 7-11 more minutes or until done.
  7. Top patties with a slice of cheese during the last 2 minutes or grilling time.
  8. Serve patties on toasted whole wheat buns with red sweet pepper relish and fresh basil leaves.