This creamy cheesecake is a decadent dessert that combines the flavors of sweet strawberries and tart rhubarb. The cheesecake is made with a graham cracker crust and a creamy filling that is flavored with vanilla and lemon zest. The strawberry and rhubarb topping is made by cooking the fruit with sugar and cornstarch until it thickens. Pour the topping over the cheesecake and chill until set. This dessert is perfect for a special occasion or a dinner party.