2prepare the bechamel sauce: properly poach the onion before adding the flour to toast the roux
3add the warm milk little by little to the roux, using a spatula to avoid developing too much gluten
4add the chopped jamon and the fried eggs to the bechamel sauce
5after 12 hours in the fridge, shape the croquettes with two spoons and freeze them to make the coating easier later and reduce the amount of falling particles during frying
6coat the croquettes in beaten egg and breadcrumbs