Skirt steak is a flavorful cut, most commonly used for southwestern fajitas, but it tends to be a little tougher than filet or sirloin steak, so marinating helps tenderize it. If you prefer, you can use strip steak instead. This recipe reflects the light, fruity, and tropical tones of contemporary Florida cuisine, and the mojo (pronounced "mo-ho") gives it a Caribbean touch. A mojo is a marinade of salsa typical of Cuban cuisine, and it is used here as the former. By definition, a mojo always contains citrus juice, garlic, and some type of herb.