kasu-cured scallop

Kasu is a by-product of sake. Also known as sake lees, it is the separated and pressed solids that remain at the end of the fermentation process. Consisting of rice, koji, residual yeast, and a small amount of alcohol, kasu can sometimes be found as a soft paste or, more readily, as square compressed sheets. It has a delicate floral yeasty aroma.

Kasu zuke is another type of Japanese pickles where food is embedded in a paste made from kasu, mirin, sugar and salt. Typically, the process is applied to white fish for a brief curing, or to fresh vegetables for longer periods.

These live scallops were so pristine that I wanted to keep them clean and chose to wrap them in kasu sheets instead of a paste. After spiral cutting them into thin, even strips, they were sprinkled with mirin, covered with kinome, then sealed between two sheets of compressed kasu. Looking like large ravioli, they cured in the refrigerator for 24 hours,. They emerged from their kasu cocoon all fragrant and delicious.