Mastering the Margarita - WSJ.com

Like any other drink, it is only as good as its worst ingredient. Fortunately, the basic margarita only has three: tequila, triple sec and lime juice. Choose a spirit made of 100% agave, stock your bar with a solid orange-flavored liqueur, squeeze fresh lime juice—think of how strong your forearms will get!—and nail the proportions and you'll have a wonderfully balanced sweet, tangy, slightly earthy (that's the 100% agave) drink to sip this Cinco de Mayo and throughout the summer.