Step 1Use tall flutes, or broad-bowled, stemmed cocktail glasses or a margarita glass. Moisten the edge of 2 cocktail glasses with a lime half, then dip each glass in the chile salt to thinly coat the rims. Add 2 or 3 ice cubes to each glass, if desired.
Step 2Squeeze the juice from the lime halves. Mix about 1 tablespoon lime juice with the orange juice and mezcal. Divide between the 2 glasses. Float a little grenadine on top, place an orange wedge on each rim and serve.