Bon AppétitMustard CaviarBy The Bon Appétit Test KitchenJanuary 17, 20124.5(5)Mustard CaviarMatt DuckorArrowJump To RecipeSave StorySave this storyPrintRecipe notesBack to topTriangleSee Related Recipes and Cooking Tips5 Fancy Condiments You Don't Need to BuyAdd some high-cost flavor to a low-budget shindig by making your own burger toppings.