Bring vinegar, 3/4 litre water and sugar to the boil. Add laurel, mustard seeds and juniper. Peel onions and cut into rings. Add meat and onions and cook everything on low heat for three hours.
Remove the meat from the stock and place it in a flat dish. Season the stock with the aquavit and pour over the meat. Leave to gel overnight in the refrigerator. Fried potatoes taste good with it.