Whenever possible, buy a fish whole. With tuna, this isn't practical; with smaller fish, it is.
Every morning when I woke up, my mother was already in the kitchen making breakfast. It was always the same: steamed rice, pickled vegetables, grilled fish and miso soup. Each day there was something different in the soup such as tofu or potatoes.
One day, the people who work in my kitchen stir-fried chopped Napa cabbage to serve with some meat or fish for their own dinner. I got to thinking: 'What if the cabbage was the most important thing on the plate?'
A sushi chef has to spot the best-quality fresh fish instantly.