Beef in Beer

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2 tablespoons beef drippings or butter, plus more as needed

1 tablespoon olive oil

3 pounds/1.5 kg sirloin tip, cut into fat fingers

3 large onions, sliced

4 cloves garlic, chopped

2 tablespoons all-purpose flour

1 tablespoon brown sugar

1 1/2 cups/375 ml beef stock

2 cups/500 ml beer

1 tablespoon red-wine vinegar

Salt and freshly ground black pepper

1 bouquet garni