Apparently the tare sauce Mukouda used is a real thing. It's a real item from an actual brand Ebara.
https://www.ebarafoods.com/products/detail/YS230.html
And the anime is partnered with several others who will probably get named when he gets to getting more seasonings for his cooking.
https://tondemoskill-anime.com/cooperation/
Great start. The food looks good, the animation is beautiful and the backgrounds are good. Makes me want to eat after watching the episode.