Mix the salt and sugar in a small bowl large enough to dip the rim of the glasses with. Rim a low-ball cocktail glass with a lemon wedge, then dip into the salt mixture, shallow for a little or deep for a lot!
Combine the tequila, pineapple and lemon juice and grenadine into a cocktail shaker with ice. Shake well and strain into a low-ball glass filled with ice. Garnish with a lemon slice.
*I just started making homemade grenadine. It's worth the effort. First make pomegranate molasses, then the grenadine. It lasts forever in the fridge and is so easy to make. Recipe adapted from Drinkology.