Besides the porcini jus, Flay includes two different condiments: a mayonnaise with whole grain mustard and horseradish, and a poached garlic butter. He finishes this elevated French dip by ...
Ingredients in Mustard Mayonnaise Recipe: A creamy, delicious mayonnaise with a spicy kick! Mayonnaise mixed with whole grain mustard, honey along with a bit of chilli powder, salt and pepper.