Pork liver is smooth, irregular shaped, and covered with a thin membrane or skin. The liver consists of four lobes of varying size marked with notches and indentations. The color of pork liver may range from light reddish brown to very dark brown (not bluish or black), with reddish shades predominating. Livers must have the heavy connective tissue removed. The large blood vessel, lymph nodes, and ducts lying along the liver wall trimmed even with the surface.