Total Calories: 285
Cut off root at the bottom end of the onion so that removal of the center is easy. Cut onions in half horizontally and remove center part of onion, leaving a 3/4 -inch thick shell. The removed center of the onion can be diced and combined with ingredients or used later.
In a 1-gallon plastic zipper bag, combine ground beef, egg, cracker crumbs, tomato sauce, salt, pepper, and dry mustard, and mix by squeezing. Divide meat mixture into 4 portions and roll into balls. Place in the center of the 4 onion halves. Put onions back together. Wrap each onion in foil. Cook over a bed of hot coals for 15 - 20 minutes per side or in 350° oven for 45 - 50 minutes, or until ground beef and onions are cooked.
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