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Gunkan or “Mothership” in Japanese is a typically Japanese way of serving ingredients which would be difficult to serve on top of a nigiri.
They are usually made by wrapping a piece of “nori”/dry seaweed around a ball of rice/shari with plenty of space left on top to fill.
Some people do not appreciate the “nori”, but it could be replaced with very thin strips of daikon, cucumber, zucchuni and so on.
I hope to introduce more in the near future!