Cut the slices of liver in half, sprinkle them all over with freshly ground pepper and flour, then shake off the excess flour. Heat the butter in a non-stick frying pan and fry the liver pieces until they are golden brown on both sides yet still pink on the inside.
Remove the liver slices from the pan, sprinkle them with salt, and keep them warm. Drain the meat juices from the pan, and instead add the vinegar to the pan and allow it to evaporate. Add the blackcurrant juice and reduce it down a little. Add the cream and allow everything to reduce down to a thick, viscous sauce. Heat the blackcurrants in the sauce and season with mustard, crème de cassis, salt and pepper.
Serve with potato croquettes and butter-steamed celery.
Tip: look at our frequently asked questions, maybe we can help you to put you on the way?