Cheesecake

Preheat oven to 350°F. Wrap 3 layers of foil around outside of 8- to 8 1/2-inch-diameter springform pan with 3-inch-high sides. Butter pan. Stir first 3 ingredients to blend in medium bowl. Mix in butter until moistened. Press crumb mixture evenly onto bottom and 1 1/2 inches up sides of prepared pan. Bake just until set, about 5 minutes. Cool completely. Maintain oven temperature.

Place cream cheese, 2/3 cup sugar, eggs, lime juice, and lime peel in processor; blend well.

Carefully spoon sour cream mixture over hot cheesecake; smooth top. Bake until topping sets, about 10 minutes. Cool 10 minutes. Run knife around sides of pan to loosen. Cool cheesecake completely. Cover and refrigerate overnight. Do ahead Can be made 2 days ahead. Keep refrigerated. Release pan sides from cheesecake; transfer to platter. Garnish with lime slices and serve.

Bring Sherry and sugar to a boil in a small heavy saucepan, stirring until sugar has dissolved. Put berries in a bowl and pour hot syrup over them, gently tossing to coat. Let stand 15 minutes.

Beat mascarpone and cream with sugar in a large bowl using cleaned beaters until mixture just holds stiff peaks.Halve cake horizontally with a long serrated knife. Carefully remove top half and reserve. Put bottom half on a plate, then spread evenly with all of cream and replace top half. Serve with berries.