• Cook pasta according to package directions.
• Meanwhile, sprinkle steaks with salt and pepper. Grill steaks, covered, over medium heat or broil 4 in. from the heat for 5-7 minutes on each side or until meat reaches desired doneness (for medium-rare, a thermometer should read 145° medium, 160° well-done, 170°).
• Drain pasta and transfer to a large bowl. Add the spinach, tomatoes, pesto and walnuts; toss to coat. Thinly slice steaks. Divide pasta mixture among four serving plates. Top with beef; sprinkle with cheese.
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