First, make the cordial. Tip the sugar into an airtight container, add the apples and ginger and leave at room temperature for 24 hrs. Add 100ml water and stir. Sieve the liquid into a jug through a fine mesh sieve, discarding the apple and ginger. Stir in the lemon juice. Will keep in a sealed container in the fridge for up to a week.

Fill a highball glass with ice. Pour over the sake and green apple & ginger cordial, then top up with the soda water and garnish with apple slices and some ginger.