01 - Remove steak from refrigerator 20 minutes before cooking to bring to room temperature. Pat steak completely dry with paper towels and season all sides generously with kosher salt and freshly cracked black pepper.
02 - Heat olive oil in a large skillet over medium-high heat until shimmering. Place seasoned steak in hot pan and sear for 3-4 minutes per side until medium-rare or desired doneness is achieved. Transfer steak to a clean plate, tent loosely with aluminum foil, and let rest for at least 5 minutes.
03 - While steak rests, bring a large pot of salted water to a rolling boil. Add fresh cheese tortellini and cook according to package directions until al dente. Before draining, reserve 1/4 cup of pasta cooking water. Drain tortellini thoroughly in a colander.
04 - Return the skillet to medium heat (wipe out excess oil but retain browned bits). Melt unsalted butter in pan, then add cracked garlic and diced shallot. Sauté for 2-3 minutes, stirring frequently, until fragrant and translucent, taking care not to brown the garlic.
05 - Pour heavy cream and chicken broth into skillet with aromatics. Add grated Parmesan cheese, Italian seasoning, crushed red pepper flakes, salt, and black pepper. Simmer sauce for 3-4 minutes, stirring often to prevent scorching, until slightly thickened and cheese has fully melted.
06 - Slice rested steak thinly against the grain to ensure tenderness. Set aside until ready to combine with pasta.
07 - Add cooked tortellini and reserved pasta water to the skillet with cream sauce. Toss gently with tongs or a large spoon until tortellini is evenly coated in sauce. The pasta water will help emulsify and thicken the sauce.
08 - Fold sliced steak strips, fresh parsley, and lemon zest into pasta mixture. Taste and adjust seasoning with additional salt or pepper if needed. Serve immediately while hot, garnished with extra Parmesan cheese and freshly cracked black pepper.