Boil salted water and cook pasta until al dente.
Drain, reserve ½ cup of pasta water.
Season steak with Cajun seasoning. Sear in olive oil for 2–3 minutes per side. Set aside.
In the same pan, sauté shrimp until pink and cooked through. Remove.
Melt butter, sauté garlic, then add cream and bring to simmer.
Stir in Parmesan until smooth. Season.
Toss pasta with sauce. Add steak and shrimp. Stir gently to combine.
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