Blue Lagoon Margarita

1 1/4 oz Jose Cuervo Especial gold tequila
3/4 oz Blue Curacao liqueur
1 splash 7-Up soda
1 splash Rose's lime juice
pineapple juice

Pour the Jose Cuervo gold tequila, blue curacao, 7-Up and Rose's lime juice into a cocktail shaker half-filled with ice cubes. Add pineapple juice to taste, and shake vigorously. Strain into an old-fashioned glass 1/4 filled with ice cubes, and serve.