Make the simple syrup by heating equal parts sugar and water in either the microwave or on the stove. Heat until the sugar is dissolved.

Salt the rim. Run a lime wedge around the rim of the glass, then dip the glass rim in a plate of coarse salt.

Combine the tequila, blood orange juice, Klarbrunn Pomelo Grapefruit Sparkling Water, lime juice, simple syrup, and ice in a cocktail shaker to combine. Gently shake a few times, then pour over ice in the rimmed cocktail glass.