How to Make It
Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Sprinkle beef with 1/4 teaspoon salt and 1/8 teaspoon pepper. Add beef to pan; cook 4 minutes on each side or until desired degree of doneness. Remove beef from pan; keep warm.
Melt butter in pan; coat pan with cooking spray. Add remaining 1/4 teaspoon salt, remaining 1/8 teaspoon pepper, red onion, and mushrooms to pan; sauté 4 minutes or until mushrooms release their liquid. Combine juice and arugula in a large bowl. Add mushroom mixture to arugula mixture; toss gently to combine. Arrange 1 1/2 cups salad mixture on each of 4 plates; top each serving with 1 steak.
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