Shita no Ue no Kimi

Kei Kuriya, a chef who was endeavoring to open his first new restaurant in Tokyo, found himself in a desert of another world after passing out in the middle of preparations. Rescued by Aisa, a girl who lives in the nearest village to the desert, he started his new life under the care of her family as he developed his cooking skills, and eventually discovered the disquieting food culture held by the citizens of that unfamiliar land.

(Source: Novel Updates)