Put the flour and fat (lard or oil) in a bowl. On one side put the yeast, and on the other the salt. Add the water slowly, mixing it in. You may not need it all. Once the mixture is holding together as a dough, you can stop adding the water. Add a little flour if it is too wet (although try to avoid this by adding the water slowly).
Knead the mixture for 5-10 minutes until it feels more elastic and is softer. Place in a bowl covered with a damp clean tea towel or some cling film. When it has double in size (this will depend on the day and the temperature of the room, always faster in an airing cupboard or by a radiator). Knock it back (punch the air out of the dough), then roll on a floured surface until it is approximately 3 mm thick.
Cut into rectangles approximately 2 inches x 1 inch. Although feel free to play around with sizes.
Test the oil by adding scraps of dough, once the dough puffs up it is ready. Fry for a couple of minutes each side, turning very carefully. Drain carefully and eat hot. Eats perfectly with parma ham stuffed inside. It is alchemy.