Karen,
Just wanted to give you a heads up - Carne Asada (at least if it's authentic) is actually marinated in fruit juices and seasonings.

A lot of places use Sunny-Delight and seasonings...I know it sounds weird, but it adds a lot to the taste! Unfortunately, it's hard to detect if you don't know it's there.

Next time make sure you ask them what they marinate it in...just be careful.