Editor's Note: This recipe was originally part of a menu by Bobby Flay for a backyard barbecue. For the complete menu and Flay's tips on throwing a party, click here.
Mustard is one of my favorite condiments. I like to use it for dressings, sauces, and, in this case, a glaze. Be sure to leave the skewers on the grill long enough to get the beef nice and crusty on both sides. This means you have to be patient, and remember: Don't turn them often.