Chuunyan Koushu no Bishoku Gaikouroku

The one who was entrusted with the crisis of the nation's survival was a princess who was good at cooking!?

The younger sister of the emperor, Reigetsu, who cooks in the kitchen of the imperial castle. On the day her homeland lost the war, she meets His Highness Fritz, the grand duke of the enemy country. In the crisis of her country's demise, Reigetsu is asked to carry out table diplomacy with Fritz as the legendary chef "Chuunyan." This is a popular Chinese-style fantasy!

(Source: Flex Comix, translated)