While your filling is cooking mix together flour, sugar and salt in a large bowl. Cut in butter and stir with fork (or your hands) until clumps form.
Add cold water and stir until desired consistency is reached.
Roll out on a floured surface and roll to about 1/4" thick.
Cut into 10 rectangles
Pour filling into one half of rectangle and fold the other half on top.
Seal with a fork.
Bake for 10 mins.