boat sushi
n.— «Nigiri: This type of sushi, where the rice has been molded and hand-pressed into an oblong shape, is often termed “boat sushi” because of its configuration. These hand-molded fingers of rice can be topped with a slice of fish, seafood, omelet or even fresh fruits or vegetables.» —“Sushi simplified” by Gail Reynolds News-Leader (Springfield, Mo.) Mar. 15, 2006. (source: Double-Tongued Dictionary)