Put the stew meat into the pan, salt and pepper. Chop the onion, add to the meat. Add just enough water to cover the meat. Pour the BBQ sauce in and stir.
Let the meat come to a boil. Stir occationally. Add water as needed. Once the meat starts to soften turn the heat down to a simmer. Stir the meat often. It will start falling apart. Use your wooden spoon to mash or chop the meat occationally. Let simmer until you have the sauce at the consistancy you like.