Pork with vinegar

1 (3 lb) pork roast, trimmed of all fat 2 cups onions , chopped 1/2 cup brown sugar , packed 1/4 cup white vinegar 6 ounces tomato paste (small can) 1 1/2[...]

2 lbs lean pork roast, cubed 7 1/2 ounces tomato sauce 1/2 cup ketchup 1 cup chopped onion 1/3 cup white vinegar 1/3 cup brown sugar , packed 1 teaspoon[...]