Classic Hamburger

Slow-cooked onions add moisture and flavor to these lean beef burgers. A quick blend of mayonnaise, ketchup, relish and vinegar makes a perfect tangy, sweet and creamy “special sauce” for this burger. We love the dill relish here, but use sweet relish if you prefer it. Serve with sweet potato fries.

Ingredients

  • 1 medium onion, chopped
  • 1 tablespoon neutral oil, such as canola or avocado
  • 2 tablespoons ketchup, divided
  • 2 tablespoons low-fat mayonnaise
  • 2 teaspoons dill pickle relish
  • 1 teaspoon distilled white vinegar
  • 1 pound lean (90% or leaner) ground beef
  • 2 tablespoons worcestershire sauce or steak sauce
  • ½ teaspoon freshly ground pepper
  • 4 sesame-seed or other hamburger buns, toasted
  • 4 slices tomato
  • 4 leaves green-leaf lettuce