Add the salsa, ½ cup orange juice, ⅓ cup roughly chopped cilantro and the pork tenderloin to a large resealable plastic bag.
Place the marinating pork in the fridge for a minimum of two hours but we highly recommend marinating it all day, preferably overnight.
Pork
Preheat the oven to 400°F. Combine the orange juice and chipotle powder in a large bowl.
Remove the pork from the marinade (discard the marinade) and wipe off any excess liquid.
Season the pork on all sides with the salt, pepper, and granulated garlic.
Over medium high heat, add oil to the cast iron skillet. Once hot, sear the pork on all sides.
Remove any excess oil and add orange slices and cilantro to the bottom of the skillet. Place the seared pork tenderloin atop them, then add additional orange slices and cilantro on top.
Pour the seasoned orange juice in and cook for 20 minutes or until the pork reaches an internal temperature of 145°F using an instant read thermometer.
Once done, allow the pork to rest for a few minutes before slicing. Serve and enjoy.
Notes
Tenderloins usually come fairly trimmed of excess fat and silver skin, but occasionally they don't. Use a sharp knife to do any trimmings, especially any silver skin.
The cooking time of 20 minutes is an approximation. Cooking by temperature is the best way. An instant read thermometer inserted into the thickest part of the tenderloin has reached a temperature of 145°F.
The cooking liquid can be thickened up with a little cornstarch slurry for a dipping sauce or gravy.