I had a wonderful sushi last night. However, I am very new to the Eastern (and specially sushi) kitchen. I know there are uncountable recipes online for making all kinds of sushi. I would like to know if someone knows a good recipe for making sushi (preferable with salmon) rolled in some kind of black leaf. I am sorry, but I don't know the right word for it. The sushi I mean is showed in the picture below.
I just don't know how to start this, and where I get all the ingredients. Can I buy them in the grocery store, or do I need to go to a special shop (I live in Belgium, so we don't have the same stores as in America)