When you take this feat you find a sandwich on the ground. Just one. Its not magical. But if your character is starving to death in the Underdark and they level up, maybe they can take this instead of an ability score increase. Whats worth more? Dying with a Dex of 20 or living to roll another day.
Its important to note this sandwich had to have been placed there. If you are in a prison demiplane, the existence of the sandwich creates the possibility of escape. Someone had to have placed the sandwich there when you were not looking.
The sandwich acts as a single ration. It does not help recover HP.You get to describe the composition of the sandwich, but it cannot contain inedible material.
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