Elevate your burgers with this delicious sauce! Just 5 ingredients and you'll have everyone asking for seconds.
In a small mixing bowl, mix together the mayo, ketchup and horseradish.
Dice up half of a small red onion about 2 tbsps and add into mixing bowl.
Wash then pat dry a handful of flat leaf parsley. Chop finely and add into mixing bowl.
Season with salt and pepper to taste. Chill for about 30 minutes before serving!