2 Process flour, sugar, hazelnut meal and cinnamon until combined. Add butter and process until mixture is crumbly. Press 3/4 of mixture over the base of pan. Press remaining mixture into a ballshape. Cover and freeze until firm.
3 Cook base in moderate oven (180C) for about 15 minutes, or until lightly browned. Cool in pan.
4 Beat cream cheese, sugar and orange rind in a bowl with an electric mixer until combined. Spread over base, then sprinkle with blueberries. Coarsely grate remaining frozen dough over top.
5 Cook in moderate oven (180C) for 30 minutes, or until topping is golden brown. Stand slice in pan for 10 minutes before cutting.
6 Serve slice warm or cold dusted with icing-sugar mixture.