For a closer look at how Nekoya uses modern 'magic' like running water to prepare its meals, check out this short clip:

Inside Nekoya, these prejudices vanish. The restaurant serves as a neutral ground where a princess, a gladiator, and a demon waitress (Aletta) can all coexist peacefully. Why This Episode Works

Comfort Food and New Beginnings: A Look at Isekai Shokudou Episode 5

This episode perfectly encapsulates why Restaurant to Another World is such a "comfy" watch. It uses food as a universal language to bridge the gap between different races and social classes.