Meanwhile, heat the oil in a large skillet over medium-high heat. Add the onion and cook, stirring frequently, until tender, 5 to 7 minutes. Add the mushrooms, 1/2 teaspoon salt and 1/4 teaspoon pepper and cook, tossing frequently, under tender, 6 to 8 minutes more. Add the wine and simmer until evaporated, about 1 minute. Stir in the parsley and tarragon.
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