Zucchini, Corn, and Tomato Dish

Cut zucchini into 1/2 inch thick slices. Saute onion in the butter for about 5 minutes. Cut tomatoes into eighths. Add zucchini, spices, and tomatoes; mix well. Bring to boil and then reduce heat. Simmer, covered, stirring occasionally for about 15 minutes. Add drained corn and cook until corn is heated through.