Isekai Shokudou
Probably this one.
http://www.mangago.me/read-manga/isekai_izakaya_nobu/
http://www.mangago.me/read-manga/tondemo_skill_de_isekai_hourou_meshi/
You talking about this one? :)
https://www.mangaupdates.com/series.html?id=141703 look here for more info
Thanks, that was the one I was looking for!
Trying to find a manga about a restaurant that is linked between modern day Japan and an RPG-like world. The chef cooks only Japanese foods and the denizens of the RPG world continue to be amazed by these Japanese dishes.
It's called 'Isekai' something, but I haven't been able to find it yet.