This easy homemade Ultimate Burger Sauce is creamy, tangy, and perfectly zippy with a classic diner style flavor. Made with simple pantry ingredients like mayonnaise, ketchup, pickle relish, pickle juice, and a hint of horseradish, it comes together in minutes and gets even better as it chills. Perfect for burgers, smash burgers, sandwiches, fries, or as an all purpose dipping sauce you will want in your fridge all summer.