Gather all ingredients before starting the recipe.
Heat 3 tbsp unsalted butter in a medium sized saucepan over medium heat. Add 1 medium finely chopped onion and 3-5 cloves grated garlic and sauté until the onions and garlic are soft, about 5 minutes. Do not let the garlic turn brown.
Clean and devein 1 lb chicken or duck livers and add to the onion and garlic mixture and sauté until livers turn brown on the outside but remain pink on the inside. About 3-4 minutes.
Add 2 tsp dried rosemary, 1/4 bunch chopped fresh parsley, 1 pinch nutmeg, 1 bay leaf, 1 tbsp celery seed, 2 tbsp fennel and season with kosher salt.
Add 1 cup port or sherry and bring to a fast simmer then reduce heat and cook for 15-20 minutes..
Transfer liver to a food processor with a slotted spoon and process until the liver is becomes a fine puree. If it looks a little dry, add some of the cooking liquid until you get a fine pate consistency.
Serve with toasted slices of baguette and Beet and Lingonberry Chutney on the side.