*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
**Nutrient information is not available for all ingredients. Amount is based on available nutrient data.
(-)Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.
Pour water, apple juice, cider vinegar, molasses, kosher salt, pickling spice, and black peppercorns in a saucepan; bring to a boil, stirring to dissolve salt and molasses. Simmer to blend flavors, about 5 minutes. Pour 2 cups ice into brine and stir to melt ice and cool brine.
Place pork loin into a large container and pack 2 more cups ice, or as needed, around the meat. Pour brine over ice and pork, cover, and refrigerate at least 4 hours to overnight.
Remove pork roast from brine and place into a slow cooker; pour 2 cups brine over the meat. Discard remaining brine. Spread sauerkraut, onion slices, brown sugar, fennel seeds, and coriander over pork roast. Set cooker on Low and cook for 3 hours. Add carrots to slow cooker and cook 1 more hour; add apples, cranberries, and walnuts and cook until an instant-read meat thermometer inserted into the thickest part of the roast reads 160 degrees F (70 degrees C), about 1 hour more.