Lamb Brothers Cocktail

Ingredients:
1 & 1/2 fluid ounces or 4.45 centilitres of Dark Rum
1/2 a fluid ounce or 1.5 centilitres of Creme de Cassis
2 fluid ounces or 6 centilitres of Pineapple Juice
1/2 a fluid ounce or 1.5 centilitres of Creme de Cassis
2 fluid ounces or 6 centilitres of Pineapple Juice
Instructions:
Shake with ice and strain into a cocktail glass.
