Pour all ingredients, except Grenadine, into a Boston Shaker. Add ice and shake vigorously. Strain and pour over fresh ice into a highball glass, Slowly pour the grenadine into the glass over the back of a spoon or by drizzling it down the side of the glass, allowing it to settle at the bottom. Don't stir!
Bring bright and vibrant flavor to your favorite tequila cocktails at home.