A Japan portal site "goo" made their own research and ranked the suitable OTSUMAMI (pairing) for SAKE.
SAKE geek has said that they enjoy pairing with salt only, top ranked stuffs are mainly salty. And tends to eat straight or simple to cook, also easy to buy like at a connivence store.
If you have interest in try some with your favourite SAKE!
Here the ranking in english with photos which links to Rakuten Global.
It is not hard as SURUME but light grilling will make SAKETOBA softer.