Write about how a chef was transported to another world where strength only matters. Then he got some powers which allows him to make special food that makes the one who eat it stronger. Not only does his food tasty it also make them stronger.
Then he was summoned by the emperor to become his cook, it is not only limited to one emperor since his fame had spread all across the world, a lot of emperors wants him to be their cook. Then he refuses them and told them that they can always come into his restaurant.
Because of this, the different emperors of each empire was able to coexist in the same place without any conflict and all because of him.
Title: "Food Emperor"