Just a pinch will do, as most recipes we've seen call for a teaspoon or 2, depending on the serving size. Another common type of mustard you'll find fused with macaroni and cheese sauce is Dijon ...
For the Big Mac sauce, simply combine all ingredients in a small bowl or jug. Heat your oven to 190C. In an oven-proof dish, evenly coat the cooked pasta in the sauce, then stir in the tomatoes ...