INGREDIENTS
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1/2 oz. dried porcini (about 1/2 cup)
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3 Tbs. unsalted butter
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2 Tbs. olive oil
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3 medium shallots, thinly sliced (about 1 cup)
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Kosher salt
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2 lb. mixed fresh mushrooms (shiitake, oyster, cremini, hen of the woods), trimmed and coarsely chopped (10 to 12 cups)
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1/2 cup dry vermouth
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2 Tbs. heavy cream
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1/4 cup chopped mixed fresh herbs, such as tarragon, parsley, thyme, chives, and sage
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Freshly ground black pepper
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1 cup instant polenta
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1/4 cup mascarpone
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1/2 oz. finely grated Parmigiano-Reggiano (1/2 cup using a rasp grater)