The British Bartender shows you how to make a great Margarita. To make a great Margarita, follow these steps: Add the following ingredients to a cocktail shaker: 1 1/2 ounces of good tequila 1/4 ounce of Cointreau or Triple Sec. 3/4 ounce lime juice. Rim the glass in some salt by moistening the rim with a lemon or lime wedge, and then roll the glass in it. Only rim half the glass in case the person you will be giving it to doesn't like salt. Add ice to the shaker and shake well. Add ice to the glass and pour the margarita into it through a strainer.