Potato Croquettes (Hot)

Take 1 lb. of cold cooked potato and place in a mortar. Mash it until all the lumps have disappeared, add a pat of butter and enough milk or cream to make the potato soft, and of the right consistency to form into balls, add a tablespoonful of chopped parsley, a very small quantity of chives (if liked), mix well and form into balls. Coat them with egg, roll them in finely-grated breadcrumbs, fry a golden brown, drain and serve.