Verdict: just like the ramen restaurants. I had to source the mirin and dark soy sauce online since our local Asian supermarket shuttered last year, but I should have plenty for many batches to come.
6.5 minutes had the yolks still very runny, I might try 7 minutes next time to make them more jammy, but still tasty and delightful all the same. Plus the ramen broth cooks them up a bit more.
Update: our server said there was ‘an accident’ in the kitchen. After 35-40 minutes they brought my entree, and chicken parm for my wife who ordered spaghetti, the server said it was what was available quickly.
Then they brought the spaghetti five minutes later. Plus more to take home. Apologized profusely, comped the whole meal. So now we have OG for days.