"Arugula, a peppery salad green, makes a tasty bed for tender, simply seasoned pan-seared steak...."
INGREDIENTS
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Cooking spray
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4 (4-ounce) beef tenderloin steaks, trimmed
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1/2 teaspoon salt, divided
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1/4 teaspoon black pepper, divided
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2 teaspoons butter
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1/2 cup prechopped red onion
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1 (8-ounce) package presliced cremini mushrooms
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2 tablespoons fresh lemon juice
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1 (5-ounce) bag baby arugula