Tortoiseshell candy, a Japanese candy, why is it called tortoiseshell candy?

Tortoiseshell candy is a Japanese-style coarse confection.

Tortoiseshell sweets are amber in color, crystal clear, like tortoiseshell turtle shells, and round in shape like turtle shells (without lines)

Tortoiseshell sweets are made of sugar, and the old-fashioned way of making them is to melt sugar and boil it into sugar syrup, and then put it on a wooden board or pour it into a mold to cool down and shape it, making them a real rough confectionery.

Tortoiseshell sweets are favored by the Japanese urban legend "Cracked Mouth Woman", and if you give her tortoiseshell sweets, you will get away safely.