Preheat oven to 300 degrees F, unless you plan to use a crock-pot. Rub the roast with a generous coating of salt and pepper, and dredge it in the flour. Warm oil over medium-high heat, and brown the roast quickly. Place the roast in a Dutch oven or heavy baking dish, or in a crock-pot. Add remaining ingredients, pouring tomatoes in last. Bake the meat 4 to 5 hours in the oven or 12 to 13 hours in the crock-pot. The pot roast will be very tender if it has cooked long enough.

If you want to make this into a one-dish meal, add large chunks of carrots and potatoes about two-thirds of the way through the cooking time.