INGREDIENTS
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3/4 oz. (1 cup) dried porcini mushrooms
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2 lb. beef short ribs
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Kosher salt and freshly ground black pepper
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2-1/2Tbs. extra-virgin olive oil
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1 small yellow onion, finely chopped
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1 small carrot, finely chopped
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1 small celery stalk, finely chopped
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1 Tbs. tomato paste
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1 bay leaf, preferably fresh
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1/2 cup dry red wine
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1-1/2 cups canned crushed tomatoes
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3 Tbs. unsalted butter
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3 Tbs. all-purpose flour
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2 cups whole milk
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3/4 cup finely grated Parmigiano-Reggiano (about 1-1/2 oz.); more for serving