There are wild sea cucumbers. In the game "The Emperor's Growth Plan 2", the prerequisite for triggering the plot princess Du Jingmei is to have a "wild sea cucumber", which can be obtained by upgrading the chef every month. The specific trigger mode is:

Go to Beijing in October.

In Beijing, you will meet an old man with a white beard, a "Beijing glutton", and choose "follow up".

When I met the scene where the story princess was chatting with her mother, I chose "Ask Restaurant" after entering the alley.

Du Jingmei will tell the address.