Blend mustard, onion, parsley, and butter thoroughly.
Shape into a small roll and chill until firm.
Barbecue chops on a grill about 12 inches above glowing coals.
Brush chops frequently with mixture of lemon juice, chili sauce, and salt; turn only once.
Cook until done to your taste 8 to 14 minutes for rare.
Remove to heated platter and place a slice of spiced butter roll on each chop.
Garnish with fresh herbs.