Papa Doble

This recipe is making me thirsty:

2 oz white rum
1 oz fresh lime juice
½ oz fresh grapefruit juice
¼ oz maraschino liqueur
1½ to 2 cups shaved ice
Combine in a blender and frappe until the drink is foaming. Serve in a large cocktail glass, champagne saucer, or goblet. Note: maraschino liqueur is NOT the same thing as syrup from a cherry jar. Fire any liquor store that tells you otherwise.