• 1/2 cup freshly squeezed orange juice 
• 1/2 cup pineapple juice 
• 1/2 cup freshly squeezed grapefruit juice 
• 15 ml grenadine 
• lemon-lime soda 
• Orange slice for garnish 

Fill a cocktail shaker half full of ice. Add the orange juice, pineapple juice, grapefruit juice, and grenadine. Shake to combine.
Fill a highball glass half full of ice. Pour in the cocktail shaker mixture.
Top off with lemon-lime soda. Stir.
Garnish with an orange slice.

Source: cocktails.lovetoknow.com