San Sebastian Cocktail

Ingredients:
1 fluid ounce or 3 centilitres of Gin
1 & 1/2 Teaspoons of White Rum
1 Tablespoon Grapefruit Juice
1 & 1/2 Teaspoons of Triple Sec
1 Tablespoon Lemon Juice
1 & 1/2 Teaspoons of White Rum
1 Tablespoon Grapefruit Juice
1 & 1/2 Teaspoons of Triple Sec
1 Tablespoon Lemon Juice
Instructions:
Shake with ice and strain into a cocktail glass.
