Kensei no Shougou wo Motsu Ryourinin

The chef Haruki Shindo accidentally transmigrates to another world, where he is blessed with the power of “Kensei,” a swordsman of god-like skill. He has mastered the blade such that he can slay a dragon with a single stroke. But he wields his blade not against demons nor dragons, but rather on the vegetable that he had grown himself! Haruki's culinary skills become highly valued, and he is taken to Lord Tamamo's castle. Haruki is called upon to create a variety of dishes to meet the impossible demands of the Lord Tamamo! (Source: Kadokawa, translated)