Clean the liver and in a suitable bowl cover it completely in milk. Place the liver in the fridge for at least three hours before draining.
Heat up a frying pan, add the butter and diced onions, brown the onions and then add the roughly chopped liver. Cook for ten minutes and then add the thinly sliced garlic cloves, the red wine and orange peel.
Cook for another ten minutes until most of the wine has dissolved. Place all the contents into a magimix and mix until you hit your desired consistency.