In skillet, saut? mushrooms, onion and garlic in butter until tender, about 2 minutes; set aside.
Combine ground pork, mustard, Worcestershire sauce, salt and pepper; mix well. Shape into 12 patties, about 4 inches in diameter. Spoon mushrooms mixture onto center of 6 patties. Spread to within 1/2 inch of edge. Top with the remaining 6 patties; seal edges.
Place patties on grill about 6 inches over medium coals. Grill 10-15 minutes, turning once. Serve on buns, if desired.
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