SALVATORE CALABRESE mixes cocktails for Kevin Spacey, Demi Moore, David Schwimmer and Cat Deeley at his Fifty club, 'so I know what makes a party go with a fizz,' he says. Calabrese suggests making The Snowstorm - a mixture of 30ml vodka,15ml limoncello, 15ml white crme de cacao, 10ml orgeat (almond syrup) and 30ml double cream. Or try his Champagne cocktail, a blend of 20ml Cognac, two dashes of Angostura bitters and a sugar cube, topped with Champagne.