From CrappyAss Translations:

Rina, summoned to another world with the use of saint summoning magic, was surprised at how unappetizing their food was. Is the palace the only place with taste like this...? I'll make the food myself instead so let me borrow the kitchen! Released from the duty of being the saint, Rina will be catching the hearts and stomachs of the royal family with her delicious food!