Cut 4 pieces of aluminum foil about 18" x 12" each. Place equal amounts of the meatballs and zucchini in the center of each piece of foil. Top each with 1/2 cup spaghetti sauce. Fold the short ends of the foil together over the center and seal, allowing room for expansion and circulation. Fold in the open edges, sealing each packet securely.
Place the packets on the grill for 15 to 20 minutes, or until no pink remains in the meat, turning the packets over once during the grilling. Carefully open the tops of the packets to avoid steam burns and sprinkle Parmesan cheese over the top just before serving.
NOTE: Serve with garlic bread sticks for dipping into the spaghetti sauce, if desired.
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