Ray's Boathouse, Seattle, Washington. This exquisite sake kasu black cod is almost synonymous with Seattle's famed Ray's Boathouse. Sake kasu is a thick paste made from the lees, or leftovers, from the sake-fermenting process. It is available by the pound at Japanese specialty stores. This preparation requires 48 hours to achieve its characteristic complex flavor, so plan ahead. To match the flavors of this complex dish, serve an equally complex wine, such as Ponzi Vineyards' Reserve Oregon Pinot Noir. From The Best Northwest Places Cookbook (Volume 1).