Take a lime wedge and rim a cocktail glass, dip the rimmed glass in tajin or salt.
Add the thinly sliced jalapeño and fresh lime juice to the glass, muddle until the jalapeños start to break down. Add in the tequila and grapefruit juice or soda. Top off with a splash of club soda, stir to combine. Add ice, garnish with a slice of grapefruit and enjoy!
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