Saute onion in the olive oil on medium heat until onion is transparent
Add flour to the saute and gradually add milk stirring constantly
When the ingredients are blended together to a smooth and creamy consistency add the diced meat salt and pepper
Continue to stir constantly until the mixture begins to boil
Cook for about 3 or 4 minutes more
The mixture should separate easily from the skillet
Then pour into a shallow pan or platter and allow to cool for several hours
You can refrigerate the mixture since the cooler it is the easier it is to handle When the mixture has cooled spoon small amounts and roll into bite size croquettes
Then bread the croquettes using bread crumbs eggs and bread crumbs again and fry to a golden brown