A cocktail consisting of 45 ml (1½ fl oz) tequila, 45 ml (1½ fl oz) Jamaica rum, 90 ml (3 fl oz) pineapple juice, just under 30 ml (1 fl oz) grapefruit or lime juice, cubes of fresh pineapple (optional). Shake with ice cubes and serve on the rocks in a Collins glass, garnished with pineapple.