You would typically find this sauce served alongside a thick cut of prime rib. The blend of mellow mayonnaise, pungent horseradish, and sharp Dijon mustard complements steak so well that it is no surprise that it does the same for a beef burger. A rich salmon burger would also take beautifully to the sauce. For a touch of extra flavor and color, try adding a few tablespoons of chopped fresh herbs such as chives, dill, or tarragon.

Ingredients

　　1/4 cup mayonnaise

　　2 tablespoons Dijon mustard

　　2 tablespoons drained prepared horseradish

　　Kosher salt and freshly ground black pepper

　　Whisk together the mayonnaise, mustard, and horseradish in a small bowl and season with salt and pepper. Cover and refrigerate for at least 30 minutes to allow the flavors to meld. The sauce can be prepared 1 day in advance and kept covered in the refrigerator.

　　Bobby Flay's Burgers, Fries, and Shakes