01 - 
                Bring a large pot of salted water to a boil. Cook pasta according to package instructions until al dente. Drain and set aside.
              
              
              
                02 - 
                In a sauté pan over medium heat, melt unsalted butter with olive oil. Add diced shallot and minced garlic, cooking for 3 minutes until fragrant and translucent.
              
              
              
                03 - 
                Stir in red pepper flakes, tomato paste, salt, and black pepper. Cook for 2 to 3 minutes, stirring occasionally, to deepen the flavor and caramelize the tomato paste.
              
              
              
                04 - 
                Reduce heat to medium-low. Pour in heavy cream and stir until the mixture is smooth and cohesive. Allow to simmer gently.
              
              
              
                05 - 
                Add cooked pasta to the sauce, tossing until evenly coated. If desired, fold in Parmesan cheese just before serving. Serve immediately.