From the previous chapters we can ascertain that the MC and the current Demon Lord are reincarnators. It wouldn't be out of place if there were more reincarnators, and they had brought culinary inventions along with them (since culinary skills are more commonplace than scientific knowledge in today's society; everyone has to eat, but not everyone wants to study a branch of engineering, for example).
@lionfromnorth well sure but its always Miso well Miso does taste good I had some but why not other soups well its Japanese manga but still diversity of food. Well just a little rambling.
@Tamerlane"Hello, welcome to my 40k Battle Report of Grot Rebellion vs Chaos Daemons."
"Hello, welcome to my AoS Battle Report of Gloomspite Gitz vs Legions of Nagash."