Run the lime wedge around the rim of a rocks or highball glass to moisten. Dip the rim into Tajín spread on a small plate so the seasoning adheres evenly. Set the glass aside.

Garnish

Cut a ruby red grapefruit wheel or wedge for garnish and reserve. If you want a prickly-pear accent, reserve a thin slice of fresh prickly pear (optional).

Cocktail

Build & shake

In a cocktail shaker, add 2 oz Teremana Reposado, 0.5 oz Cantina tequila, 2 oz fresh ruby red grapefruit juice, 1 oz prickly pear purée, 0.5 oz fresh lime juice, 0.5 oz agave syrup, and a handful of ice. Secure the shaker and shake vigorously for about 10–15 seconds until well chilled and slightly frothy.

Strain

Fill the prepared glass with fresh large ice cubes (or crushed ice if preferred). Double-strain the shaken mixture into the glass to remove pulp and seeds so the drink is smooth.

Top with soda

Gently top the cocktail with 2 oz soda water. Stir once or twice lightly with a bar spoon to integrate but preserve effervescence.

Finish & serve

Float a thin ribbon of prickly pear purée or drizzle 0.25 oz extra prickly pear down the side for color contrast (optional). Garnish with the grapefruit wheel on the rim and a light dusting of Tajín over the grapefruit if desired. Serve immediately with a straw.