2 ½ cups ice, divided
4 fluid ounces orange juice
2 fluid ounces tequila
¾ fluid ounce grenadine syrup
Fill a highball glass with 1 1/2 cups ice and set aside.
Combine orange juice and tequila in a cocktail shaker; add remaining 1 cup ice. Cover and shake until the outside of the shaker has frosted. Strain into the prepared highball glass. Slowly pour in grenadine and let settle. Stir before drinking.