Step 1

Spread 2 teaspoons Tajín Clásico seasoning in an even layer on a small flat plate. Halve 1 medium lime. Cut 2 thin lime wedges from one half. Run a lime wedge around the rim of 2 old-fashioned or margarita glasses to moisten. Invert the glasses into the Tajín, turning it as needed, to coat the rim. Reserve the lime wedges for garnish.

Step 2

Juice the remaining lime pieces until you have 1 ounce. Place the lime juice, 3 ounces blanco tequila, 1 ounce orange liqueur, 1/2 cup well-stirred coconut cream, 2 cups frozen pineapple chunks, and 1 cup ice cubes in a blender, preferably high-speed. Using the tamper if needed, blend until smooth, about 1 minute.

Step 3

Pour into the prepared glasses and garnish each with a lime wedge and pineapple slice if desired.