From 取(と)り (tori, “連(れん)用(よう)形(けい) (ren'yōkei, “stem or continuative form”) of the verb 取(と)る (toru).”) + 皿(さら) (sara). The sara changes to zara as an instance of rendaku (連濁).
とりざら • (torizara) ←とりざら (torizara)?