Zucchini Garden Chowder

2 medium zucchini, chopped
1 medium onion, chopped
2 tablespoons minced fresh parsley
1 teaspoon dried basil
1/3 cup butter or margarine
1/3 cup all-purpose flour
1 teaspoon salt
¼ teaspoon pepper
3 cups water
3 chicken bullion cubes
1 teaspoon lemon juice
1 can (14-1/2 ounces) diced tomatoes, undrained
1 can (12 ounces) evaporated milk
1 package (10 ounces) frozen corn
¼ cup grated Parmesan cheese
2 cups (8 ounces) shredded cheddar cheese
Pinch sugar, optional
Additional chopped parsley, optional

In a Dutch oven or soup kettle over medium heat, sauté the zucchini, onion, parsley and basil in butter until vegetables are tender. Stir in flour, salt and pepper. Gradually stir in water. Add the bullion and lemon juice; mix well. Bring to a boil; cook and stir for 2 minutes. Add tomatoes, milk and corn; bring to a boil. Reduce heat; cover and simmer for 5 minutes or until corn is tender. Just before serving, stir in cheeses until melted. Add sugar and garnish with parsley if desired. Yield: 8-10 servings (about 2-1/2 quarts).