What you will need:
1-3/4 oz gin
3/4 oz fresh grapefruit juice
3/4 oz simple syrup
1 tablespoon sparkling wine
3 drops of chilled basil oil to garnish

Step 1: Pre-chill a cocktail glass by placing it into the freezer for 5 minutes

Step 2: Add 3 drops of the basil oil into the prepared glass and set aside

Step 3: Place the gin, grapefruit juice and simple syrup into a cocktail shaker filled with ice

Step 4: Vigorously shake the mixture for 35 seconds and then add the sparkling wine

Step 5: Strain the mixture into the prepared cocktail glass and serve immediately