"Castor sugar" (wanda kuma aka rubuta "caster sugar") yana nufin nau'in sukari mai laushi wanda ya fi kyau a rubutu fiye da fararen sukari na yau da kullum amma ba mai kyau ba kamar sukarin foda. Ana amfani da ita a cikin yin burodi da kayan abinci don yin meringues, da wuri, da kayan zaki. Sunan "castor sugar" ya samo asali ne daga gaskiyar cewa lu'ulu'u na sukari suna da ƙananan isa don dacewa ta hanyar "castor," wanda shine nau'in sieve da ake amfani da shi a cikin kicin. A wasu ƙasashe, ana iya kiransa "superfine sugar" ko "sukari mai burodi."