August 5: National Mustard Day Food Holiday Mustard is a yellow spread or sauce that makes sandwiches, burgers, and your mother's cooking yummy. Recipes: Whole Grain Dijon Mustard by Chow.com Best Mustard Ever by FoodNetwork.com 6 DIY Mustards by Sunset.com Beer Mustard by AllRecipes.com Social: Tweet Back to the month page! You know there's more stuff to click!