Beat the eggs in a suitable bowl and mix lightly with a whisk or wooden spoon.
Let the flour trickle through a sieve into the baking bowl with the eggs. Then gradually add the milk.
Stir until smooth and leave to cool for 1 hour.
Heat the frying pan. Brush with butter and pour in a little batter with a ladle.
Swirl the pan to spread the batter evenly and bake the pancakes at a moderate temperature.
When the edges curl, turn the crespella to the other side with a spatula and bake from the other side.
Stack the pancakes one on top of the other and use each according to taste.