Preheat oven to 325º. Lightly spray springfrom with vegetable spray.

In a medium bowl, stir together graham cracker crumbs, lemon rind and sugar. Stir in butter, mix well. Press mixture into bottom prepared springform pan. Bake 8 minutes. Remove from oven, cool.

In large mixer bowl, beat cream cheese until light and fluffy. Beat in sour cream and eggs one at a time. Beat in sugar, cornstarch, vanilla and lemon rind until mixture is smooth. Pour into cooled crust. Place a shallow pan of water on bottom rack. Place springform pan on cookie sheet. Bake 1-1/4 hours or until puffed and golden brown (top will be slightly cracked all over). Turn oven off and leave 1 hour with oven door ajar. Cool and refrigerate at least 4 hours.