Line 9 X 5-inch loaf pan with plastic wrap; set aside.
Beat Starbucks® Java Chip Frappuccino® Ice Cream in bowl with electric mixer just until stirrable. Stir in lemon peel, then fold in 1 cup whipped cream. Fold in remaining whipped cream.
Gently press mixture into prepared pan. Cover and freeze 4 hours or overnight.
Remove from pan using plastic wrap; discard plastic wrap. Cut into 1-inch slices to serve and drizzle with chocolate sauce.