In a large bowl, stir together 3 tablespoons of oil, the lime zest, habanero, 1 tablespoon salt and 1 teaspoon pepper. Transfer 2 teaspoons of the mixture to a small bowl and set aside. To the remaining oil-zest mixture, whisk in the lime juice, bouillon and ¼ cup water. Add the chicken and onions and toss. Cover and let marinate at room temperature for 1 hour or refrigerate up to 2 hours, stirring once.