Another winner from allrecipes.com is this delish pork recipe. It calls for 1 1/2 cups of fresh lime juice...holy lot of limes! I squeezed an entire bag of limes and only had 1 cup. That was plenty of juice for 2.5lbs of tenderloin so you can definitely decrease the amount of marinade from what the original recipe calls for. It's simple ingredients, marinated for a few hours, then cooked. The recipe says to grill it, but I just baked it and it was wonderful.
The meat was super tender from all the acidic lime juice, and it had a wonderful flavor. Highly recommend!