Fill the bottom of a small plate or shallow bowl with granulated sugar. Then take a slice of lemon and make a small cut halfway down the center as if you are going to use it as a garnish. Place the cut part on the rim of the glass and run it along the rim until covered with juice. Remove the lemon and tap the rim of the glass in the sugar. DO NOT twist the glass in the sugar. This will only cause it to rub off rather than stick.