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Garnish: lime wedge
If using the preferred clay cantarito cup, soak it in cold water for 10 minutes.
Rim the cantarito cup with Tajín seasoning.
Add the tequila, fruit juices, and salt to a shaker with ice and shake until well chilled.
Strain into the prepared cantarito cup (or a Collins glass) over fresh ice.
Top with the grapefruit soda and stir briefly and gently to combine.
Garnish with a lime wedge.