ive been an avid sushi eater for years and years but just recently ive been trying to really learn the finer points about it. my first question is about wasabi. i love fresh grated wasabi but a lot of sushi places either dont have it or dont have it on the menu... at Ebisu (my regular sushi bar) i ask for hon-wasabi... is this a) rude, or b) stupid or incorrect? and is there a particular name for fresh grated wasabi i can request?
my other question is about oshi-zushi, osaka-style sushi. is there any place in town that does this style exceptionally well? kabuto and ebisu dont offer it.
last question is about tuna. what exactly is the difference between "premium" tuna or bluefin tuna and yellowfin tuna? if i want the best quality maguro they have what do i request?
thanks in advance