Pressed Sushi with Vinegar-Cured Mackerel

Saba-zushi, mackerel sushi, the pressed sushi that is very popular in Japan, has been made in the old imperial capital of Kyoto for several hundred years. It is prepared with excellent-quality saba, mackerel, which is caught seasonally in nearby Wakasa Bay on the Sea of Japan, about 45 miles from Kyoto. Today the journey takes less than one hour by road, but in the past, the fish, which was caught early in the morning, packed with salt in barrels, then rushed to the capital by