1. Sprinkle Tajin seasoning on a small plate. Moisten the rim of a large rocks glass with a slice of lime, then dip the glass in the seasoning to fully coat the rim.

2. Add tequila, tamarind syrup, Cointreau, agave and lime juice in a cocktail shaker with ice. Shake to combine, about 30 seconds.

3. Add ice to rimmed glass and pour drink into glass. Garnish with lime and enjoy.