"Who says a gratin has to arrive on the table in a baking dish? In this version, the potatoes, spices, and cheese are layered and baked in a springform pan, giving the dish a cake-like look...."
INGREDIENTS
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4 pounds red-skinned sweet potatoes (yams; about 3 1/4 pounds)
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1 tablespoon curry powder
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1 tablespoon ground cumin
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3/4 teaspoon ground cinnamon
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3/4 teaspoon ground ginger
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1/2 teaspoon (scant) salt
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1 1/2 cups sour cream, divided
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3 cups shredded extra-sharp white cheddar (about 12 ounces)