Try out this low calorie recipe for fry sauce, it's just 20 calories and has 2.4g of protein per 1/8 cup.This Freddys fry sauce "copycat" recipe is made with Greek Yogurt and mustard in place of mayonnaise. This helps boost protein and lowers the calories and fat.Below you'll learn how to make French fry sauce at home, in a healthy new way. And further down we even share our low calorie French fry recipes!