Always prepare your glasses first.
If you decide you want a salted rim on your glass, wipe a segment of lemon or lime around the rim, then press it into a saucer of salt and fill with ice.
If you do not require a salt rim simply fill the glasses with ice to the top.
Fill a litre jug with the tequila, Triple Sec or Cointreau and lemon juice.
Stir vigorously for 10