Re. Sushi: I buy from Cape Town fish market at the Waterfront or give your cell number to the guys at the Spar at the top of Derry Street in Vredehoek and they will text you when they get in fresh Tuna.
Then if you’re really hardcore the best place in the world is also the most hidden. Its on Keoberg Road and its an old Church (can’t remember the number – their is NO signage). Inside is a wholesale fish distributor and a seafood lovers heaven. They don’t normally sell to the public… but if you have cash and a smile… :)
Flip i just gave away all my secrets, sssshh!

For all the people that love sushi in Cape Town, here is a brief history:
The traditional form of sushi is fermented fish and rice, preserved with salt in a process that has been traced to 7th century China and even Southeast Asia, where it remains popular today. The term sushi literally means “sour-tasting”. The vinegar produced from fermenting rice breaks down the fish proteins into amino acids. This results in one of the five basic tastes. The vinegar accentuated the rice’s sourness and was known to increase its shelf life, allowing the fermentation process to be shortened and eventually abandoned. The seafood and rice were pressed using wooden (usually bamboo) molds. By the mid 18th century, this form of sushi had reached Edo The contemporary version, internationally known as “sushi”, was created by Yohei Hanaya at the end of the Edo period in Edo. The sushi invented by Hanaya was an early form of fast food that was prepared quickly and could be eaten with one’s hands at a roadside or in a theatre. Originally, this sushi was known as “Edomae zushi” because it used freshly caught fish in the Edo-mae. Though the fish used in modern sushi no longer usually comes from Tokyo Bay. The increasing popularity of sushi around the world has resulted in variations typically found in North America and Europe, but rarely in Japan. Such creations to suit the Western palate were initially fueled by the invention of the California Roll. Other rolls may include spicy tuna, Philadelphia cream cheese, and assorted assorted vegetables such as cucumber and avocado. Sometimes, sushi rolls are made with brown rice and black rice, which appear in Japanese cuisine as well. Rainbow Roll (an inside out topped with thinly sliced salmon, salmon and avocado) and the Caterpillar Roll (an inside out topped with thinly sliced avocado). Also commonly found is the Rock prawn roll (an inside out roll with spicy tuna and avocado with toasted sesame seeds on the outside topped with tempura prawns) and the Tempura roll where an entire roll is battered and fried tempura style.