in oil and butter. Place in a 3 qt Dutch oven. Top with onion slices. In the same skillet, heat tomatoes, bouillon and seasonings until bouillon is dissolved. Pour over the drumsticks. Cover and bake at 325 degrees for 2 hours, basting once or twice. Add potatoes and zucchini. Cover and bake for 20 minutes. Remove drumsticks and vegetables to a serving dish and keep warm. Combine the cornstarch and water until smooth; stir into tomato mixture. Return to the oven, uncovered for 10-15 minutes or until slightly thickened. Pour over drumsticks and vegetables. Sprinkle with parsley.