From Jewels and Jill Elmore. This makes a lot of marinade. If you don't want to make as much pork, split the marinade in half and use on chicken for tostadas, tacos, or salad. Achiote paste can be found in the latin food aisle at the grocery.
Mix all marinade ingredients in a blender, the marinade should taste a bit salty.
Put the pork in a large Ziploc bag and pour over the marinade. Refrigerate 1 to 4 hours.
Preheat oven to 400°F Heat a large heavy skillet over high heat. Add two pork loins and brown on all sides. Remove from pan and transfer to a sheet tray. Brown the other two tenderloins. If you don't have a large pan you can do one at a time or brown them on the grill.
Finish cooking in the oven another 10 to 15 minutes.