FILL COCKTAIL MIXING GLASS WITH ICE AND ADD THE SWEET TEA, SUGAR CANE SYRUP, EGG WHITE AND LIME JUICE. DRY SHAKE WITHOUT ICE. ADD THE CUCUMBER AND MINT AND FILL SHAKER WITH ICE. SHAKE TO CHILL BEFORE STRAINING INTO A COCKTAIL GLASS. FLOAT FERNET BRANCA ON TOP AND GARNISH WITH CUCUMBER AND MINT.