Julio Bashmore recently worked on music for Jessie Ware, and now the smooth London singer has returned the favor for the forward-leaning Bristol, U.K., producer. Bashmore helmed Ware’s “Imagine It,” released as part of the “Gold Edition” of her Essential album Devotion. He also produced her masterful breakout track “110%,” which had to be called “You’re Never Gonna Move” after sample-clearance troubles. Now Ware lends her vocals to Castor’s “Peppermint,” which just debuted on BBC Radio 1 DJ Annie Mac’s show. The sparse four-on-floor bounce and repeated dance-diva “I’m hot for you” hook nod toward vintage Chicago house — specifically, Lil Louis’ “I’m Hot for You” — but crucially, those echoes of the past cruise through a silvery contemporary sensibility. You could almost say Bashmore underuses Ware’s dusky coo, if that understated quality wasn’t already part of her allure.