I recently combined an order with a friend from Japan Centre (here) online. As she had said that she only likes the Japanese Kewpie mayonnaise, I thought I'd try some.
I did buy some other bits as well - and you've seen some of the results of that order - the sushi, the onigiri..but I think this is one of my favourites. Life changing and AMAZING!
I definately recommend a bottle of this stuff if you have a chance. Kewpie. Mmm. It's gorgeous on chips, as a salad dressing..er with sushi..