Cranberry-Lime Cheesecake

To prepare cheesecake: Preheat oven to 325 degrees F. Coat a 9-inch springform pan with cooking spray. Tightly wrap the outside of the pan, bottom and sides, with a large piece of heavy-duty foil. Put a kettle of water on to boil for the water bath.

Combine graham cracker crumbs and oil in a small bowl. Press into the bottom of the prepared pan.

Process ricotta in a food processor (or blender) until smooth. Add cream cheese and puree until smooth. Add 2 teaspoons of the lime zest, 5 tablespoons of the lime juice, eggs, 1 cup sugar, vanilla and 1/2 teaspoon salt; process until smooth. Scrape into the prepared crust.

Place the cheesecake in a roasting pan. Pour enough boiling water into the roasting pan to come 1 inch up the side of the springform pan to create a hot water bath for the cake. Carefully transfer the roasting pan to the center of the oven. Bake the cheesecake until set around the edges but the center still jiggles slightly, 1 1/4 to 1 1/2 hours.

Transfer the roasting pan to a wire rack. Let the cheesecake cool in the water bath until the water is room temperature, about 2 hours.

Remove the pan from the water bath. Remove the foil. Refrigerate, uncovered, until very cold, at least 3 hours.

To prepare topping: Combine cranberries, water, 1/3 cup sugar and pinch of salt in a medium nonreactive saucepan (see Tips). Bring to a boil over medium-high heat. Combine 2 tablespoons lime juice and cornstarch; stir into the pan. Cook, stirring, until thickened, about 1 minute. Let cool completely before spooning onto the cheesecake.