Before we even walked into the restaurant, there was a Japanese couple set up in their zen outdoor space making okonomiyaki, which is s Japanese pancake. We tried one while waiting for a table, and it was better than the actual food in the restaurant. Rintaro has a very authentic feel to it right down to the slow service...the hostess wouldn't seat us even though there were multiple empty tables. I continue to go back though because I like the experience and food, especially the clear broth udon. Also try their sake cocktails! I love cocktails that incorporate tea in them and this is the only place so far in SF I've found!