El Diablo

Directions

1. 1
   Juice the lime half with a citrus squeezer, reserving the inverted hull.
2. 2
   Pour the tequila, grape juice, and lime juice into a tall collins glass filled with ice.
3. 3
   Top with ginger ale to about 1/2 inch (13 mm) from the top of glass.
4. 4
   Stir gently.
5. 5
   Place the inverted lime hull into the top of the cocktail, rind side up, and fill the lime bowl with creme de cassis.
6. 6
   Serve immediately with a straw.