In large saucepan, combine chicken livers, sliced onions, garlic, celery seed and bay leaves. Cover with water. Bring to a boil. Turn off heat and livers sit in mixture for 10 minutes. Drain, remove livers and set aside. Discard onion/garlic mixture.
In a medium saute pan, cook livers, shallots and garlic in 1/4 cup butter until livers, shallots and garlic are soft. Remove from heat and blend in food processor.
Add remaining ingredients, blend in food processor. Turn into serving dish. Cover and chill several hours or overnight.