Bitterballen (Dutch meatballs)

Melt the butter in a skillet or pan. When melted, add the flour little by little and stir into a thick paste. Slowly stir in the stock, making sure the roux absorbs the liquid. Simmer for a couple of minutes on a low heat while you stir in the onion, parsley and the shredded meat. The mixture should thicken and turn into a heavy, thick sauce.

Pour the mixture into a shallow container, cover and refrigerate for several hours, or until the sauce has solidified.