After speaking to many a sushi chef, including those that make "traditional" sushi and had actually come from Japan to work in a very authentic establishment, here is what I would like to state...
- Putting additional wasabi on your sushi is considered bad form and an insult to the sushi chef. By doing this, you are pretty much saying that he made the sushi incorrectly or that the fish is bad.
- Place a bit of Soy Sauce on your dish and lightly place your Sushi into it. Do not drench it!
- The ginger is to cleanse your palate between types of sushi. Putting it ON the sushi not only defeats the purpose, but you also run into an issue like the one above.
- Sushi should never taste FISHY! Fish, when fresh, should have a very subtle flavor. If it tastes "fishy" then it is not fresh.
- I have always been told to use chopsticks when eating Sushi, not your fingers
I will admit though, the best Sushi I have ever had was in London at Harrod's department store. They have many different specialty food areas, including a Sushi bar. All I can say is OMG it was wonderful!