1.5 Oz White Rum

0.75 Oz Fresh Squeezed grapefruit 

0.75 Oz Elderflower Syrup

0.5 Oz Gum Syrup

Sprig of Mint 

Top with Topo Chico and Ice

Add All Ingredients To A Cocktail Shaker. Shake Briefly To Combine. Strain Into Highball Glass. Top With Crushed Ice, sprig of mint and topo chico.