Chocolate Streusel Slice

Directions

1. 1
   Base:.
2. 2
   Cream butter and sugar until just combined, stir in sifted flour, mix to a firm dough.
3. 3
   Press evenly into well greased 30cm x 25cm Swiss roll tin.
4. 4
   Bake in moderate oven 10 minutes, spread with filling.
5. 5
   Grate topping evenly over surface, bake in moderate oven further 10 minutes.
6. 6
   stand 15 minutes before cutting.
7. 7
   Filling:.
8. 8
   Combine all filling ingredients in saucepan, stir over medium heat until mixture begins to bubble on base of pan.
9. 9
   Continue stirring briskly for about 3mins or until mixture is thick.
10. 10
    Topping:.
11. 11
    Sift dry ingredients in a large bowl, rub in butter.
12. 12
    Mix to a firm dough.