Ingredients

1 lime wedge, for garnish 

Coarse salt, for rim 

Ice 

1 teaspoon lime juice 

1 ounce platinum tequila 

1 bottle Mexican grapefruit soda 

Preparation

Rub rim of a highball glass with lime wedge; invert glass in a small dish of coarse salt, twisting to coat rim. Fill glass halfway with ice, 1 teaspoon lime juice, and 1 ounce platinum tequila, then top with Mexican grapefruit soda. Stir. Place cored-out lime half in drink and fill with tequila (try a reposado for added flavor).