Rub pork with salt, pepper, and garlic. Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add pork; cook 3 minutes on each side or until browned. Transfer pork to a 5-quart round electric slow cooker coated with cooking spray. Add stock to pan, scraping to loosen browned bits; cook 2 minutes. Pour stock mixture over pork; add water. Cover and cook on LOW 8 hours or until tender.
Remove pork from slow cooker, and place in a medium bowl. Pour broth into a medium skillet. Bring to a boil over high heat; boil 5 minutes or until reduced to 2/3 cup.
While broth reduces, shred pork using 2 forks. Stir in broth reduction.
Warm tortillas according to package directions. Serve pork with tortillas, sour cream, if desired, and Chimichurri Sauce.
I made this without doing the browning of the pork in the pan. I tossed the loin with the rub and the liquids all into the slow cooker and after 8 hours it came out great. Saves time and dishes. I agree with a previous reviewer that the pork is slightly bland but the chimichurri makes up for that. One corn tortilla is basically useless at holding this together.
I'm afraid I don't agree with the comment about the pork having "outstanding flavor" ... we actually found the meat a little bland on its own. Prepared the recipe as written. If we make it again, we'll add more spices to season it for sure. Fortunately, the chimichurri is great (we also added cilantro to it). And there is no way one single soft corn taco will hold up, I guess that's why they are always doubled up in restaurants. We attempted to eat them that way, and the tacos just fell apart.
Delicious. I have a smaller than recommended slow cooker so I cut the pork loin in half. I also was short on time, so I started the slow-cooker on high for 2 hours and turned it down to low for the last 2-3 hours.