Cut any fat off the pork loin, chop into chunks, place in crock pot or in pot for the stove.
Juice oranges for 1 cup of juice (about 3-4 oranges) and chop up the thyme.
Add fresh orange juice, thyme, and adobo sauce (optional) to the crock pot or regular pot that already contains the pork loin. Add water to cover the meat.
For crock pot, set to cook as usual, low setting if cooking all day, higher setting if cooking faster.
For stove, place pot over low heat, cover, and let simmer (checking water level & stirring occasionally) for about 4-4.5 hours.