I served it with two kinds of cucumber salad (one with thinly sliced myoga and one with thinly sliced red onion, both salted, washed and then excess moisture wrung out and dressed in vinegar dressing). I also put both grated ginger and wasabi.
As you can see below, this is very well vinegared and the meat is all opaque (i.e. chemically cooked) which is the same in packaged frozen vinegared Mackerel.
The below was how it came. One package had three filets of sanma.
After thawing, I blotted excess moisture and sliced it slightly obliquely.
The only drink that goes with this is sake. This sake called "Tozai Living Jewel" is widely available in US and appears to be an export only brand from Kizakura brewery 黄桜酒造 in Kyoto, Japan. We have tasted turbid sake from them before called “snow maiden” “Tozai Yuki musume” 東西雪娘.
The current one is "junmai shu" 純米酒 and it is not too yeasty, Although it does not have depth or complex flavors or fruity note (which is more from ginjo and daiginjo flavors) and the taste disappears quickly in the palate (i.e. short finish), it is quite a drinkable sake. This one went particularly well with a strong oily fish with vinegar and sweet taste of vinegared sanma we were having.
So, we enjoyed this dish and sake.