3 oz of Gin
1 oz of Lemon Juice
1 tbsp of Grenadine
1 tsp of sugar syrup (or simple syrup)
sparkling water
orange slice
Combine all ingredients, except orange slice and sparkling water, in a cocktail shaker with cracked ice. Shake well. pour into chilled highball glass. Top off with sparkling water, stir gently, and garnish with orange slice.