Place the pork loin in a slow cooker. Thinly slice the onion and place them on top and around the pork.  Add the garlic, paprika, salt, and pepper. Mix the Tones beef paste and water together then pour on the pork. Cook on low for about 8 hours. After the meat is cooked take out and shred it. Throw out any fat. Leave a little bit of the liquid in the crockpot. Place the meat back into the crockpot and add the desired amount of bbq sauce. Let this cook for 20-30 minutes. Then assemble the sandwiches.