INGREDIENTS
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3 1/4 lb (1.7 kg) beef round steak 3/4 inch (2 cm) thick, cut into 1/2 inch (1 cm) wide and 2 inch (5 cm) long strips.
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1/2 cup butter
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2 large (1 lb / 450 g) onions sliced
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2 cloves garlic crushed
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5 cups ( 3/4 lb / 350 g) mushrooms thinly sliced
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2 tsp salt
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1/2 tsp pepper
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1 cup beef stock fat removed
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1/4 cup tomato paste
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1/4 tsp dry mustard
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1 1/2 cups sour cream