Classic G&T So it’s not a cocktail, but we couldn’t leave out the classic gin and tonic, could we? For the perfect Gatehouse Gin and Tonic… Ingredients 50ml Gatehouse Gin 150ml Chilled Premium Tonic Water Ice Method Fill a balloon glass with ice cubes and pour over the Gatehouse Gin. Add 150ml of chilled premium tonic water. Garnish with a slice of red sweet apple. The perfect G&T serve!