Cut a small wedge from the lime and set aside for garnish. Moisten the rim of a cocktail glass with a little lime juice and press into a small dish filled with salt. Lightly tap the glass to remove excess salt.
Place the ice cubes in a shaker. Add the tequila, orange liqueur and lime juice. Shake vigorously and pour the Margarita through a bar sieve into the prepared glass. If desired, add some ice, garnish with a lime wedge and serve.