Slice tenderloins lengthwise without cutting all the way through.
Combine remaining ingredients in a food processor and blend.
Pour mixture over pork and refrigerate for several hours to allow flavors to blend.
Remove pork from marinade and grill over medium-hot coals until pork is done; you may baste pork with remaining marinade as you grill.
If you would like to use hotter peppers feel free.
Serrano peppers are about a 7 on a scale of 10 for heat.
Habanero peppers and scotch bonnets are the hottest with a 9-10 rating.
If you prefer less heat, try using an Anaheim pepper that rates about a 3 but still has great flavor.