Three-Vegetable Gratin
["1 lb. sweet potatoes, pared", "1 lb. parsnips, pared", "1 Tbsp. fresh lime juice", "1 tsp. cornstarch", "1 c. whole-berry cranberry sauce", "2 Tbsp. low-fat margarine", "1/2 tsp. grated ginger", "1 1/2 lb. butternut squash, pared and seeded"]
["Boil a large pot of salted water.", "Slice vegetables to 1/8-inch thick, keeping separate.", "Boil potatoes 5 minutes. Remove with slotted spoon to colander to cool.", "Repeat with parsnips, boiling 6 minutes.", "Repeat with squash, boiling 2 minutes."]
["sweet potatoes", "parsnips", "lime juice", "cornstarch", "whole-berry", "low-fat margarine", "grated ginger", "butternut squash"]