Pat Temples orange or lemon biscuits

Pat Temples orange or lemon biscuits

An empty milk carton
125gr butter
200 gr sugar
1 large egg
1 orange or lemon zest
250 gr plain flour
2 tsp baking powder
½ tsp salt

Mix sugar, butter, egg and zest
Then add salt, baking powder and flour
Put all in an empty milk carton. Let it stand in the fridge for a days or freeze
Slice with a sharp knife and bake at 180ºC on baking sheet for 5-10 mins