Grilled Zucchini Packets

3 medium zucchini, sliced
1/2 (one-half) pound fresh white mushrooms, sliced
1 medium onion, thinly sliced
1 medium green bell pepper, seeded and diced
1/2 (one-half) cup uncooked minute brown rice
1/2 (one-half) cup vegetarian spaghetti sauce

Preheat charcoal grill. Place all ingredients in a medium bowl and toss until well coated. On a work surface, place four sheets of heavy duty or doubled aluminum foil, each about 20 inches long. In the center of each piece, place zucchini mixture, dividing equally. Bring long sides of foil together over mixture, allowing space for heat circulation and expansion. Crimp together. Fold up short ends and crimp to seal. Place packets on a rack over preheated grill, about five inches from heat source. Cook until vegetables are tender and rice is cooked, about 15 minutes, turning once. Remove and let stand for five minutes. Carefully unfold foil to serve four.