1 1/2 oz of Tequila
2 oz of Orange Juice
1/2 oz of Lemon Juice
1 dash of bitters
2 tsp of blue curacao liqueur
1 oz of grapefruit juice
Pour tequila, orange juice, grapefruit juice, lemon juice and bitters in a cocktail shaker half-filled with ice cubes. Shake and strain into a highball glass almost filled with ice cubes. Carefully float the curacao on top by pouring over the back of a teaspoon, and serve.