Substitute chayotes for the zucchini. For softer chayotes, increase cooking time to 20 min. or until chayotes are tender, adding small amount of water if necessary to prevent chayotes from drying out.
In addition to adding tart flavor to your favorite dish, sour cream also adds a creamy consistency to the sauce. Be sure to add the sour cream at the end of the cooking time to prevent it from curdling.