Fill shaker with ice and add all of your ingredients, with the exception of the soda water, and shake hard for 12 seconds. Strain into a Collins glass filled with ice and top up with soda water. Garnish with mint and a slice of lemon.
* To make the eucalyptus & honey syrup, combine 250ml of water with 250ml of honey and 20g of eucalyptus leaf (or a few drops of eucalyptus essential oil). Heat gently in a pan, until the honey thins, then leave to infuse for 20 mins.
45ml La Republica Gin
30ml eucalyptus & honey syrup*
15ml lemon juice
1 egg white
100ml soda water
Mint and a slice of lemon, to garnish