Sauteed Scallions, Mushrooms, and Asparagus

• 1 pound fresh shiitake mushrooms, stemmed
• 1 tablespoon vegetable oil
• Coarse salt and ground pepper
• 1 pound asparagus, trimmed and sliced diagonally into 2-inch pieces
• 2 bunches (3 to 4 cups) scallions, sliced diagonally into 2-inch pieces
• 1 teaspoon white-wine vinegar

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Thinly slice mushrooms. In a large nonstick skillet, heat oil over high heat. Add mushrooms; cook, tossing often, until browned, about 10 minutes.

Meanwhile, bring 3 cups salted water to a boil in a small saucepan; add asparagus. Cook until crisp-tender, 3 to 5 minutes; drain.

To mushrooms, add asparagus and scallions; season with salt and pepper. Cook, tossing, until scallions have wilted and pan is dry, about 2 minutes. Stir in vinegar; serve immediately.