Polly's Baked Brisket

1 (4.5-pound) untrimmed beef brisket
3 tablespoons olive oil
1/4 cup white wine vinegar
2 tablespoons vegetable oil
2 tablespoons ketchup
1 teaspoon salt
2 teaspoons garlic powder
2 teaspoons pepper
1 (1.4-ounce) envelope dry onion soup mix
1 cup water

Brown brisket in hot olive oil over high heat 5 minutes on each side. Place in a lightly greased 13- x 9-inch pan.
Stir together vinegar and next 6 ingredients; pour over brisket. Add 1 cup water to pan.
Bake, covered, at 350 for 2 hours, basting ever hour. Reduce oven temperature to 300 and bake 1 more hour. Skim fat from drippings, discarding fat; serve drippings with brisket.

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