This is traditionally how salmon roe (ikura), small scallops, and sea urchin (uni) are served.
- The nori is cut into halves and then into strips about an inch wide.
- Rice about the size of a ping pong ball is formed into a mound.
- The nori is wrapped around the rice and held in place by pasting together with crushed rice grains. The rice should be pressed down so that there is 3/8 to 3/4 inch of space above the rice.
- The rice is coated with a little wasabi and the roll is filled. These are served in pairs.
Note 1: For salmon roe or small scallops, about 3/8 inch (10mm) of space is needed, and the roll filled with the roe.
Note 2: In the case of sea urchin (uni is an acquired taste/feel, though actually quite bland), the space should be closer to 3/4 inch (20mm). Sea urchin is spooned into about half of the remaining space. Usually, the sea urchin is packed slightly and the unbroken yolk of a quail egg (uzura no tamago) is placed on top of the sea urchin. (This is also an alleged aphrodisiac, and not traditionally offered to women.)