A flavorful and easy-to-make topping to elevate your burger experience.
Combine the ketchup and mustard in a mixing bowl.
Use a whisk for a smoother blend.
Add the finely chopped onion and parsley to the bowl.
Chop the parsley finely to distribute the flavor evenly.
Stir all the ingredients together until well combined.
Taste and adjust seasoning if needed.
Serve immediately or chill for a few minutes before using.
Chilling enhances the flavors.
