Beat the egg and cheese together to form a smooth paste, beat in the flour, and use a spatula to form into a half-inch (1cm) thick rectangular slab on a freshly-scalded and rinsed board. This was ‘no broader than the hand’. This might mean either a 4-inch or 9-inch ‘hand’, but is here assumed to be 4 inches/10cm.
Heat the fat until hot, but not boiling. Using the edge of a wet spatula (