Mississippi Barbecued Pork

2 1/2 lbs pork butt roast
1 TBS corn oil
4 oz can tomato Sauce
1/4 cup cider vinegar
1/4 cup Worcestershire sauce
1/4 cup brown sugar
1/2 teaspoon celery seed
1/2 teaspoon chili powder
salt and pepper to taste
Dash or two of red pepper sauce (to taste)

These amounts need to be increased for larger roasts

Heat oven to 350 degrees or can cook on med-Low on stove-top.  Cook
with tight fitting lid on pan to keep in the juices.  Randomly
pierce the roast with a knife then brown it all over.  Combine the
remaining ingredients in a bowl then add to the roast and bring to
boil, then reduce the heat to a simmer.  Cover and either keep
cooking (turning every now and then) or place in the oven and bake
for 2 hours or till fork tender and meat falls from the bone.
While baking one can baste and turn about every 45 mins or so.