INGREDIENTS
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3–4 Tbsp extra virgin olive oil
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9 oz button mushrooms, halved (or quartered if they are large)
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2 small onions, sliced
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4 cloves garlic, finely chopped
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3 1/3 lb stewing beef, cut into 2-inch chunks
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2/3 cup red wine
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1 Tbsp chopped fresh thyme leaves
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1 Tbsp red wine vinegar
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1 1/2 lb baking or russet (floury) potatoes, peeled and cut into 1/4-inch slices
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2 Tbsp butter, diced