Laura's Signature coffee

My eldest daughter Laura was here for a few days and what was nice was just ambling around for a few days with no pressures.
She works for Kaffee Eis in Wellington and Taupo, and I asked her for some details because it's a very successful chain of coffee and gelato stores. The biggest-selling flavour is chocolate - that means there are many people who agree with me!
Laura (the most eligible young woman in Wellington) entered the Mojo Coffee competition in 2009 and she's agreed to share her signature drink with you here:
Laura's Barista Baritone
4 shots espresso
1 orange
1/2 lime juiced
2 shots hazelnut syrup
sparkling water
ice
mint leaves for garnish
Add the orange and lime juice to the espresso, the hazelnut syrup and a few cubes of ice in a shaker. Turn shaker end on end to combine. Serve in martini glasses, strained over fresh ice. Top up with sparkling water and add the mint leaves.