My nephew wrote this one down for me. – Chris 1 medium onion chopped2 Tbsp butter2 Tbsp vinegar2 Tbsp brown sugar4 Tbsp lemon juice½ Tbsp prepared mustard3 Tbsp Worcestershire sauce1 cup ketchup½ lb hamburgsalt and pepper to taste Cook onions until soft. Add other ingredients with exception of hamburg. Sauté hamburg in pan separate. Combine