STIR together ½ cup mustard, ½ cup honey, 2 tablespoons lemon juice, garlic, salt and 2 teaspoons pepper in a large shallow dish or heavy-duty zip-top plastic bag; add pork, turning to coat. Cover or seal, and chill 3 hours. Place pork on a lightly greased rack in an aluminum foil-lined roasting pan.
BROIL 6 inches from heat 5 minutes; reduce oven temperature to 425, and bake 15 minutes. Cover loosely with foil, and bake 15 more minutes or until a meat thermometer inserted into thickest portion registers 160.
STIR together remaining ½ cup mustard, remaining ¼ cup honey, remaining 1 tablespoon lemon juice, remaining ½ teaspoon pepper, and mayonnaise. Serve mixture with pork.
YIELD: 6 serbings.
Prep: 15 min., Chill: 3 hrs., Broil: 5 min., Bake: 30 min.