Grate butter into flour, mixed with salt and cream of tartar.
Mix with sufficient soda water to make a soft dough.
Dough can be used immediately, or wrapped and kept in the 'fridge.
It will keep for a week.
OR Cut 1 lb.
butter into 1 lb.
flour, sifted with a pinch of salt.
Mix with a small bottle of soda water.
If time permits, roll and fold three times, chilling in between.
Or chill at least 1 hour before using; roll out thinly.
Bake at 450° F.