I don't know what they're actually called, but never mind. I made a dill sauce out of oil, vinegar, cream, lemon juice, salt and sugar and left it for a bit to make it all dill-y. While I was waiting, I prepared some cucumber, salad, and smoked salmon on a plate, then poured the dill sauce on top.
I'm thinking of trying to make sushi next, but i'm scared I might poison myself. I might wait until i'm back in the UK, where i'm certain of my fish-vocab.