Take a fresh lemon, cut it into two wedges, and rub off the wedge in the rim of the cocktail glass until it is wet properly. Dip the wet rim of the glass in the salt on a plate.
Put ice cubes in the cocktail glass according to your need. Four large ice cubes will be enough for one Charro Negro Cocktail.
Pour 1 oz of fine quality tequila into the cocktail glass and squeeze the juice of the remaining lemon wedge into it.
Add a pinch of common salt if you like, and top the drink with cola.
Take a stirrer or large spoon and stir the drink for 5 to 10 seconds in order to mix all the ingredients well.
Garnish the Charro Negro Cocktail with a fresh lemon wedge and serve straight away.