I made a big batch of these when the family were all here in early March. The box which was full on the Friday was nearly empty by the Sunday night.
Over the last few days I've made them twice more and put both lots in the freezer, one box full for Willows birthday party and another for Easter Sunday tea ( saving just a few to eat now of course)
8oz cold butter
12oz plain flour
Ground black pepper
Teaspoon mustard powder
8oz Cheddar cheese - preferably nice and strong
Beaten egg to brush over
Rub butter into flour and salt, stir in 2oz of the cheese add egg and maybe a tsp ice cold water to make a stiff dough.
Wrap in cling film and chill for half an hour (I don't bother to do this and they are fine)
Then form dough into an oblong, roll out very thinly and sprinkle half the remaining cheese over half the rolled out dough. Fold over the plain bit and repeat....roll, sprinkle, fold.
Roll out again - just less 1cm thick trim the edges and cut into fingers, as neatly as possible
Brush with beaten egg.
(You could sprinkle some finely grated Parmesan or paprika over. I don't.)
Lift with a spatula onto a greased baking sheet then hot oven 220C/gas 7 for 10 to 12 minutes.
Lift off tray with a spatula to cool on a wire rack.
High calories and very more-ish