Cook onion and grated ginger, covered, in margarine or butter over low heat about 20 minutes or until very tender, stirring occasionally. Uncover and cook over medium-high heat about 10 minutes or until onions are a deep golden color, stirring frequently.
Add the zucchini or yellow summer squash and apple, stirring gently to coat. Cover and cook for 3 to 5 minutes more or until zucchini and apple are just tender, stirring often. Makes 4 side-dish servings.