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theShear - following on most isekai mangas... cooking/culinary arc is mandatory... either detailed or just a filler; sooner or later... i haven't read the novel so i can't really tell... but lets just assume that this manga doesn't based on novel, then my assumption on what is coming next is pretty much convincing... also lets not forget that the main purpose of satou's journey, his destination is elf village right now which is south-east of duchy capital... just in case you forgot, open ch.3 page 18 about rice and ch.20 page 19 (top-left) about elf village location... his inner thoughts on page 19 totally indicating that he will go there to get his share of 'RICE'...
and what comes after rice for japanese especially after satou has finally able to visit duchy?? a whole wide cuisines varieties made from rice will be sure introduced later...
This is an assumption coming from me as a manga reader that yet to read the novel... for those novel readers that fully know the plots after this arc, please pardon me as i was just wildly guessing...
but then again, on most isekai mangas i have read until now, cooking arc is most likely mandatory... if you really need some refs then you can check isekai mamono, tensei ouji, saving 80k gold, genjitsushugisha, takarakuji de 40-oku, tensei slime, world teacher, choujin koukousei, maid kara haha, konjiki no word master, etc... all of the mentioned above are mangas that has a common modern cuisines nowadays brought and/or being made in another world and was introduced as a newly invented cuisines there by MCs...
it's not an exaggeration to have an assumption there will be a cooking arc for the next plot...
TL;DR... just a bit of my penny... totally IMHO, don't take it seriously...