In a cocktail shaker, pour tequila, triple sec, lime juice, and add some ice cubes.
Close and shake it !
Rub the quarter lime on the rim of a margarita glass.
Then, dip the rim of the glass in the salt, making sure it goes only at the outside of the glass.
Pour the cocktail in the glass, ornate with a lime slice, and there you are !
Alcohol consumption is dangerous for your health