1. Place all the ingredients except the nutmeg in a small Kilner jar or jam jar and fill with ice.

2. Shake hard for 20 seconds, then strain into a chilled coupe glass or martini glass to keep the ice out.

3. Grate some nutmeg on top and serve.

To make the sugar syrup:

1. Just mix equal parts caster sugar and boiling water, stirring for 2 to 3 minutes, until the sugar has dissolved and the syrup is clear.

2. Try starting with 250g caster sugar and 250ml water.

3. Let it cool before pouring into a clean jar and store in the fridge for up to 1 month.