Clam Bar provides you a buff with 20 stamina and spirit for 30 minutes.
Source
Clam Bar is crafted by Cooks with a skill level of 300. This requires a Cooking Fire.
The components are:
This recipe can be obtained from a vendor in Sporeggar for 1 [Glowcap]; you will need to be at least Neutral with Sporeggar before you can interact with him.