Mix dry ingredients in a large bowl then add cold butter pieces.
Use a pastry cutter to incorporate the butter until it is in little pea sized bits of butter and flour.
Sprinkle in 7 tbsp of cold water and mix.
Form a ball, it should stick together. Add 1 more tablespoon of water if necessary.
Pour the dough onto a cutting board, form a ball, then divide in half.
Make a ball with each half, flatten and cover each in plastic wrap.
Refrigerate for 1 hour or more before rolling.