Cr?me de Cassis, JB Allain (Majestic, £5.99). Vital stock for any serious wine lover, this rich blackcurrant liqueur is the key ingredient when a dash is added to white wine to make Kir. (Named after a Burgundian called Paul Kir who cleverly used the cassis trick to disguise some lesser Aligot? whites.) Real aficionados will, of course, have picked up a bottle of Cr?me de M?re (the blackberry equivalent) on their last trip sur la continent and serve it 'Royale', with champagne rather than cheap white wine.