Bearnaise Mayonnaise

Beef tenderloin with béarnaise sauce is one of the glories of classical French cuisine. Given fresh tarragon’s affinity for grilled beef, it’s easy to see why. Like all egg-based sauces, béarnaise can be tricky to make, so I came up with a béarnaise-flavored mayonnaise that has all of the classic’s vibrant flavor and none of its temperamental chemistry. It’s the perfect accompaniment for the Herb-Crusted Grilled Beef Tenderloin.