1) Whisk the cream and vanilla in a chilled bowl with a whisk or an electric mixer just until they hold a loose peak. (Lift the beater from the cream and look at the shape of the peak at the end of the whisk; it should hold a lazy curve.) Sift the sugar over the cream and continue to beat just until it holds a soft peak. Take care not to over beat the cream or it will look curdy. Serve, or refrigerate covered for up to 4 hours.