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1
Cut out the center portion of the loaf, leaving about 3/4 of an inch of bread on the sides and bottom.For the meat loaf: Mix the panko, salt and pepper and add to the ground beef, mixing gently with your hands. Do not overwork or compact the meat for best texture.
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2
In a small bowl, whisk together the parsley, thyme, garlic powder, dry mustard, ketchup, Worcestershire, wine and eggs. Add the mixture to the meat. Gently combine until thoroughly incorporated.Form the meat into a loaf that resembles the cavity in the bread. Transfer the meat into the bread's cavity, adjusting the shape as necessary to ensure that the meat firmly contacts the bread on all sides. Using the edge of your hand, make a large indentation down the center of the meat loaf. The indentation should be about 1 1/2 inches wide and 2 1/2 inches deep. This space will allow the meat to expand as it cooks, yet still leave a space for the toppings to rest in.Cover the bottom and sides of the bread with a double layer of aluminum foil to protect it from drying out. Place the loaf on the grill over indirect heat. Cover the grill and cook with vents open for about 1 hour, or until the internal temperature of the meat reaches 140u00b0-145u00b0 for medium.
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3
For the toppings: Add 1 tablespoon vegetable oil to a hot skillet, then add the onion. Cook over medium heat, stirring occasionally, for about 20 minutes, or until the onion has reduced by about half of its original volume. Season with salt and pepper. Remove from skillet and set aside.In the same skillet, add the remaining 1 tablespoon oil and the mushrooms. Saute over medium-high heat for 8 minutes, or until the mushrooms have released most of their water. Season with salt and pepper.
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4
When the meat loaf has reached an internal temperature of 140u00b0, place a layer of mushrooms, followed by a layer of onions in the space created for the toppings. Allow these toppings to heat through for 5 minutes, then add the grated cheese. Cover and cook for another 5 minutes, or