Ingredients
2 cups sliced fresh mushrooms1 medium onion, thinly sliced1 tablespoon butter1 large egg, lightly beaten1/3 cup whole milk1/2 cup old-fashioned oats1/2 teaspoon salt1/4 teaspoon pepper1-1/2 pounds ground beefSAUCE:1/2 cup ketchup2 tablespoons brown sugar2 teaspoons prepared mustard
Preparation
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 12x8-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 thermometer reads 160°. Let stand for 15 minutes before slicing.
