It all started when mustard company French's announced they had teamed up with ice cream maker Coolhaus to create mustard-flavored ice cream to coincide with National Mustard Day this Saturday. Thankfully, it's not available in DFW (only LA & NY). Not to outdone, hot dog maker Oscar Mayer clapped back at French's asking "who eats just mustard? Condiments were made for an Oscar Mayer hot dog... so voila! Check out the Ice Dog Sandwich, with hot dog infused ice cream, made with real bits of candied Oscar Mayer hot dogs served alongside spicy mustard ice cream."