Put all the ingredients, except for the pork fat, into a bowl and whisk until the batter is smooth and all the flour has been incorporated. Set the batter aside to rest for 1 hour.
Heat the pan over a medium heat and grease the bottom with pork fat. Using a ladle, pour batter into the pan and swirl it around.
Cook the crepe on one side until golden and then using a palette knife or fish slice, flip the crepe over and cook the other side.
Remove from the pan to a cloth to remove excess fat and not moisten the dish with excessive heat. Move to a plate.
Repeat this operation until the batter is finished.