I have also consumed sushi as as the main course, but on 1st nite of Shovu’os; This is the only Yom Tov which cannot commence on a Friday nite, and this topic specifies a Friday nite, hence I did not mention Shovu’os nite in my 1st comment to this topic.
Go look up the definition of sushi – it’s a rice dish that can be made with fresh fish, cooked fish or vegetables. The word sushi comes from the Japanese word for rice.