Grilled Stuffed Meat Loaf Recipe

In a large skillet, saute mushrooms and onion in butter until tender; set aside. In a large bowl, combine the egg, milk, oats, salt and pepper. Crumble beef over mixture and mix well. On a large piece of heavy-duty foil, pat beef mixture into a 12-in. x 8-in. rectangle; spoon mushroom mixture to within 1 in. of edges. Roll up jelly-roll style, starting with a short side and peeling foil away while rolling. Seal seam and ends. Discard foil. Prepare grill for indirect heat, using a drip pan. Form a double thickness of heavy-duty foil (about 14 in. square); cut three slits in foil. Place meat loaf on foil; place on the grill rack over drip pan. Grill, covered, over indirect medium heat for 35 minutes. Combine sauce ingredients; brush over loaf. Grill, covered, 15-20 minutes longer or until meat is no longer pink and a meat thermometer reads 160 °. Let stand for 15 minutes before slicing.