The yellow substance of steamed crabs is crab yellow. Crab yolk is the ovary and digestive gland in crabs. It's orange and delicious. Crab yolk is not a crab egg. Although its composition is basically the same as crab roe, there are essential differences between them. Crab yellow contains protein, phospholipids and other nutrients, which are rich in nutrition. When steaming crabs, because crabs are steamed on their backs, crab roe will be lost. Steamed crabs are best steamed on the back to avoid crab roe flowing out.

What is the yellow thing that comes out of steamed crabs?

According to the "Food Classics", female swimming crab has the effects of appetizing, moistening lung, tonifying kidney and strengthening yang, nourishing blood and promoting blood circulation. Among crab roe, crab roe has the highest nutritional value. It is rich in trace elements, collagen, calcium, phosphorus and other essential nutrients, and is known as "gold in the sea". Male crabs have seminal vesicles, and white material in them is sperm. The sperm and sex organs of male crabs are crab paste.

Crab paste may also be fat. Because in order to prepare for the winter, male crabs gradually accumulate fat and grow into crab paste (commonly known as crab oil). Peeling off the shell of the male crab, you can see that there are white sticky things in the crab shell and crab tuo, which is crab paste (crab oil). After cooking, crab paste becomes translucent. The more crab paste, the stronger the male crab.

In the wild environment, in September of the lunar calendar, the crab roe of female crabs grows the most plump; /kloc-In October, the crab paste (crab oil) of male crabs grows thickest. Therefore, there used to be a saying that eating crabs is "nine females and ten males", which means eating females in September and males in October in the lunar calendar.