Chocolate Swirl Cheesecake
["2 c. graham cracker crumbs", "1 1/2 tsp. ground cinnamon", "1/2 c. butter or margarine, melted", "2 (1 oz.) sq. semi-sweet chocolate", "2 (8 oz.) pkg. cream cheese, softened", "1 c. sugar", "6 eggs", "1/4 c. plus 1 Tbsp. all-purpose flour", "1 1/2 tsp. grated lemon rind", "3 Tbsp. lemon juice", "1 tsp. vanilla extract", "1 c. whipping cream, whipped", "grated chocolate (optional)"]
["Combine graham cracker crumbs, cinnamon and butter, mixing well.", "Firmly press into bottom and up sides of a 9-inch spring-form pan, then refrigerate.", "Place chocolate in top of a double boiler; bring water to a boil.", "Reduce heat to low; cook until chocolate melts.", "Set aside to cool slightly.", "Beat cream cheese with electric mixer until light and fluffy.", "Gradually add sugar, mixing well.", "Add eggs, one at a time, beating after each addition.", "Stir in flour, lemon rind, lemon juice and vanilla. Fold in whipped cream."]
["graham cracker crumbs", "ground cinnamon", "butter", "semi-sweet chocolate", "cream cheese", "sugar", "eggs", "flour", "lemon rind", "lemon juice", "vanilla extract", "whipping cream", "chocolate"]