6 medium yellow squash, cut into 2 inch slices
3 medium onions, cut into 2 inch slices
1/4 tsp garlic salt
2 Tbs butter
salt & pepper to taste

Alternate squash & onion slices in rows on a large sheet of aluminum foil. Sprinkle with garlic salt, salt & pepper; dot with butter. Fold foil securely to seal; place on grill & cook over moderate heat for about 45 minutes or until tender.