Winter Black Truffles (Tuber Melanosporum) - whole flash frozen truffle. From Perigord, France. More or less a round shape, its size can go up to the size of an apple and even bigger, but it usually weighs around 2-3 oz. Its skin has a pyramidal scale and it's flesh goes from grayish to black with thin white veins when mature. A good truffle should be firm and have a black flesh with thin white veins. Use within one week after opening.