Use fresh lime juice rather than bottled for the cleanest taste. If the blue color looks too light after shaking, add an extra half ounce of blue curaçao to deepen the shade. Black sea salt gives a nice contrast on the rim, but regular salt works if that is what you have on hand. Serve the drinks right after pouring so the ice does not dilute the color too quickly.
Course: Drink
Cuisine: Mexican
Equipment: Cocktail shaker, Margarita glasses, Jigger