1 teaspoon finely grated fresh lemon zest
1/2 cup fresh lemon juice
1/2 cup sugar
3 large eggs
1/4 cup unsalted butter, cut into small pieces
1 1/3 cups finely ground graham cracker crumbs ( 5 oz)
1/3 cup sugar
3/4 teaspoon salt
5 tablespoons unsalted butter, melted
3 (8 ounce) packages Philadelphia cream cheese, softened
1 cup sugar
3 large eggs
3/4 cup sour cream
1 teaspoon vanilla
Whisk together zest, juice, sugar, and eggs in a 2-quart heavy saucepan. Add butter and cook over moderately low heat, whisking frequently, until curd is thick enough to hold marks of whisk and first bubbles appear on surface.
Force lemon curd through a fine-mesh sieve into a wide shallow dish, scraping bottom of sieve, then cover surface with wax paper. Cool completely, stirring occasionally, about 30 minutes.
Put oven rack in middle position and preheat oven to 350°F
Stir together crumbs, 1/3 cup sugar, 3/4 teaspoon salt and 5 Tablespoons butter in a bowl, then press onto bottom and 1 inch up side of springform pan. Place springform pan in a shallow baking pan and bake 10 minutes, then cool crust completely in springform pan on a rack.
Reduce oven temperature to 300°F.
Wrap springform pan with two layers of aluminum foil.
Beat together cream cheese and 1 cup sugar in a bowl with an electric until smooth. Reduce speed to low and add eggs 1 at a time, beating until incorporated. Beat in sour cream and vanilla until combined.
Pour two thirds of cream cheese filling into crust, then spoon half of lemon curd over filling and swirl curd into filling with a small knife. (Avoid touching crust with knife to prevent crumbs getting into filling.) Repeat with remaining filling and curd.
Place sprigform pan in a larger cake pan or roasting pan; place on oven rack and fill halfway up the sides of larger pan with boiling water.
Bake cheesecake until set 1 1/2 inches from edge but center trembles when pan is gently shaken, about 1 hour to 1 1/2 hours. (larger pan will have shorter baking time; smaller pan will have longer baking time) (Center of cake will appear very loose but will continue to set as it cools.) Transfer springform pan to a rack and immediately run a knife around top edge of cake to loosen. Cool completely, about 2 hours, then chill, uncovered, at least 4 hours. Remove side of springform pan before serving.
â?¢ Lemon curd can be made 1 week ahead and chilled, covered.
â?¢ Crust (without filling) can be made 1 day ahead and kept, covered, at room temperature.
â?¢ Cheesecake can be chilled, loosely covered, up to 2 days. Cheesecake must be completely chilled before covering to prevent condensation on its surface.
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