Herring tartare / Tatar ze śledzia

A proven and delicious recipe for a herring tartare which can be served as a side or a as a main meal. I usually make it around Christmas and it's an excellent idea for Christmas eve but it's also a great idea for important family gatherings and any holidays. Enjoy and Smacznego! Ingredients: 420 grams of herring from the salt brine 450 mls of buttermilk 70 grams red onion 2 cucumber pickles 90 grams pickled mushrooms (preferably forest mushrooms) 1/2 apple 1 tablespoon unsalted butter Ingredients for the sauce: 1 tablespoon French mustard 1 tablespoon honey 3 tablespoons olive oil 1 tablespoon lemon juice 1 pinch of ground juniper berries 1 pinch of black pepper Decorations for the top: 1 egg yolk green parsley or dill leaf for decorations