Make a marinade of buttermilk, juniper berries, bay leaves, peppercorns and crushed garlic cloves and let the meat, cut into cubes, stand in it for two days.
Lift the meat out of the marinade and allow to drain. Heat the butter and fry the meat in it, dust with flour and let brown. Mix red wine with tomato paste and pour over the meat, dilute with a little water, add salt and cook covered for about 75 minutes. If too much liquid evaporates, add a little marinade. When the meat is nice and soft, season to taste and serve.