Heat butter in tight, fully covered saucepan. Add onion and garlic,cook over low heat for 5 minutes. Add tomatoes and juice and bring toa boil. Sprinkle rice on top of tomatoes. Add salt, pepper cayenneand soup mix. Cook for 15 minutes. Then add green pepper, celery,parsley and basil. If necessary, add a little water or tomatoe juiceand cook for another 5 minutes. Transfer to a casserole dish and addshrimp, chicken and juices, sliced mushrooms. Cover tightly. Bake inpreheated oven for 15 minutes 180ºC till shrimp are cooked,but not overdone.