The base of this bean sauce is a light roux, which gives it a thick and smooth consistency. The method is simple, so even beginners can manage it. The sauce is served with boiled beef, egg and potatoes.
Melt the butter in a saucepan, sprinkle in the flour, stir and fry briefly until a light roux forms.
Thin the roux with the stock and the brine from the beans.
Season the sauce with salt to taste and simmer for 5 minutes.
Add the cream and stir in the beans.
Add vinegar to taste if you like, then let the sauce simmer for another 5 minutes.
Serve with boiled beef, egg and potatoes.