SPRINKLE gelatine over warm water; set aside. Combine crumbs and butter; press firmly onto bottom of 9-inch springform pan.
BEAT cream cheese, sugar and lemon peel in large bowl with electric mixer on medium speed until well blended. Add gelatine mixture, melted chocolate bars and whipped cream; beat just until blended. Pour over crust.
REFRIGERATE 4 hours or overnight. Run knife or metal spatula around rim of pan to loosen cake; remove rim of pan. Top with raspberries just before serving. Store leftover cheesecake in refrigerator.