The next step in making our croquettes is to prepare the dough base. In a large frying pan, melt the 100 grams of butter over a medium heat. If you want to give your croquettes a softer, sweeter touch, add a small, finely chopped onion and fry it until it becomes transparent. This step is optional, as some ham croquette recipes do not use onion, but it will add a nice nuance.
Once you have the butter melted and the onion browned (if you have decided to use it), add the flour all at once. Stir well with a whisk so that the flour cooks and loses its raw flavour, this should take about 3-4 minutes. When we see that the flour begins to have a yellowish colour, we will know that it is ready.
Start adding the infused milk little by little, stirring constantly. It is best to add it in small quantities, making sure that it is well absorbed before adding more. The most important thing about this step is to stir constantly with the whisk to prevent lumps from forming and thus obtain a smooth and perfect bechamel.
It is time to add the ham. Since it is a top quality ham, it is not necessary to cook it for a long time, since its flavor intensifies in the process. Add the pieces of ham to the mixture and mix well so that they are evenly distributed.
Finally, add salt and pepper to taste, and if you want a touch of nutmeg.