Sushi sushi sushi!!
I love making sushi but usually stick with avocado and cucumber. Partly because it's easy, partly because anything dipped in soy sauce and wasabi tastes awesome, and partly because I didn't know where to buy proper ingredients like you get at a sushi restaurant.
Billingsgate has a great selection of fresh fish in a large glass cabinet at the back of the market, including sashimi grade tuna and salmon. We grabbed a slab of each, originally thinking we could cook any extra that we wouldn't use in time as there was so much. That was before slicing it up and dipping it in sashimi soy sauce! So fresh and it just melts in your mouth! I think about half made it into the actual sushi in the end and there was definitely none left over at the end.
There were two people working behind the counter on a Saturday afternoon, both were friendly and efficient. The market also stocks some handy sushi making ingredients like seaweed and wasabi.