After Cooking 29, you can receive this task from the innkeeper of XLSS, and go to the Twilight Camp to find a cookbook, which is located in the camp on the west side of senario Fortress, very close. Just find this cookbook on a box and take it back to the innkeeper. The material is the meat of the worm+one of Shuxin grass. If you don't have cooking skills, you shouldn't be able to take this task.

this task is easy to do, and one person can complete it.