The other day I made fajita marinade for some delicious chicken. It was good but not great. After some thought, I realized I used a different lime juice. The best lime juice, of course, is from a real lime. Sometimes it is not practical to always have fresh limes around so lime juice in a bottle is the next alternative. The best one I have found is the juice that comes in a plastic lime looking container (I cannot remember the manufacturer). No wonder, once you find a good brand, is to stick with it.
dougthecook