2 cups crushed shortbread cookies (about 28 cookies) 3 tablespoons butter or margarine, melted 4 Pralines, coarsely crumbled 5 (8-ounce) packages cream cheese, softened $ 1 3/4 cups sugar $ 2 tablespoons all-purpose flour 1 1/2 teaspoons vanilla extract 4 large eggs $ 2 egg yolks $ 1/3 cup whipping cream 1 teaspoon grated lemon rind $ 2 (8-ounce) containers sour cream 1/3 cup sugar $ Garnish: crumbled Pralines Preparation Combine cookie crumbs and butter. Press into bottom and up sides of a greased 10-inch springform pan. Bake at 350° for 8 minutes. Cool on a wire rack. Sprinkle coarsely crumbled Pralines over crust. Beat cream cheese at medium speed with a heavy-duty electric mixer until creamy. Gradually add 1 3/4 cups sugar, flour, and vanilla, beating until smooth. Add eggs and egg yolks, 1 at a time, beating just until yellow disappears. Stir in whipping cream and lemon rind. Pour in crust. Place on a foil-lined baking sheet. Bake at 350° on lower oven rack 10 minutes. Reduce oven temperature to 325,° and bake 1 hour and 20 minutes or until almost set. Cool on wire rack 1 hour. Stir together sour cream and 1/3 cup sugar; spread over cheesecake. Bake at 325° for 10 minutes. Cool on a wire rack. Cover and chill 8 hours. Remove sides of pan. Garnish, if desired.