4 pounds boneless beef chuck roast
1 tablespoon olive or vegetable oil
1 teaspoon salt
1/2 teaspoon freshly-ground black pepper
6 medium onions
1 1/2 cups beef broth
3/4 cup regular or nonalcoholic beer
2 tablespoons brown sugar - (packed)
3 tablespoons Dijon mustard
2 tablespoons cider vinegar
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