Tribeca Canvas, which has been up and running for several weeks in an oft-renovated, brick-lined space down on Church Street, is not the kind of restaurant we’re used to seeing from the glamorous Iron Chef and sushi master Masaharu Morimoto. There’s no elaborate, wood-carved omakase room on the premises. Cocktails are served at a small bar in the front of the house instead of in a giant, disco-size lounge. The spangled, boom-era ornamentation favored by Morimoto’s longtime business partner Stephen Starr (who’s not a partner here) has been replaced by a slightly foreboding, bare-bones décor (gray wooden tabletops; dim, guttering candles; strips of canvas painted with what appear to be dark, scraggly trees). Instead of the usual lavish sushi delicacies, the menu features hamachi tacos, tuna tostadas, and even Iron Chef-style interpretations of ancient comfort-food totems like fish and chips, and mac and cheese.