Chop pecans in a food processor and place in a shallow dish. In another dish, pour enough milk to dip the fish. Melt a generous amount of butter in a fry pan. Dip fish in milk and pecans and then lay in pan. Repeat with all pieces of fish. Pat extra pecans onto fish while in pan. Flip after 5-7 minutes or until brown. Cook on other side until done. Can be served with tartar sauce (but it doesn't need it!).