Preheat the oven to 325 F. Place the beef on a large sheet of heavy foil. Rub the beef thoroughly with the onion, garlic, seasonings and a little vegetable oil. Cover beef with the foil, sealing the edges all around with tight crimps; place the foil package in a baking pan, and bake 2-1/2 to 3 hours, or until the beef is fork-tender. (If you hear much sizzling as it cooks, turn down the heat.) When the beef is ready, unwrap the top of the foil package, push aside the onion, and place the meat close to broiler flame. Allow to broil only until the top surface begins to look dry and is starting to brown. Remove from the broiler, and let the meat cool. Shred into long pieces with fingers; then serve, or store in the refrigerator (for up to a week) or freeze. Makes about 4-1/2 cups; 425 calories per 1/2-cup serving. beef 21