Add linguine to a large pot of salted boiling water and let cook until al dente, about 7 minutes. Drain well.
While pasta is cooking, add butter and olive oil to a large skillet over medium heat. Add garlic and red pepper flakes and cook for one minute.
Add shrimp, salt, and pepper to pan and cook, stirring frequently, until shrimp are cooked through and pink, about 5 minutes. Remove shrimp to a plate and set aside.
Stir in white wine (or chicken broth) and lemon juice and cook for 1 minute. Remove skillet from heat and stir in parsley. Add linguine and shrimp back to skillet and toss to coat in sauce.
Divide between two plates or bowls and top with sliced steak. Sprinkle on additional chopped parsley.