Bring a large pot of water to boil, lightly salt if desired. Add tortellini and cook 7 minutes, or until al dente. Drain and rinse, set aside.
Meanwhile: Heat 1-tablespoon olive oil in a pan to medium-high heat. Add steak, sprinkle with salt and pepper. Cook 5-7 minutes, stirring often, until browned and internal temperature reaches least 145°. Cut into smaller pieces and set aside. Wipe off pan.
Heat remaining olive oil in same pan to medium heat. Brown garlic for 1 minute then add spinach. Cook until wilted. Stir in cooked tortellini, steak and pesto sauce; heat longer if necessary. Serve with freshly shredded parmesan as garnish.