Prepare the vegetables: Clean the vegetables and slice the mushrooms and onion. Mince the garlic cloves. Boil the water and cook the pasta according to the instructions on the packet.
Cook the steak: Preheat the pan on high heat and melt the butter. Add the steak and cook it for 2 minutes on each side.
Sauté the aromatics and mushrooms: Prepare a separate pan and preheat it on medium-low heat. Add olive oil and sauté the garlic and onion for 3 minutes. Stir occasionally to prevent burning. Once cooked, set them aside and add the mushrooms to the same pan. Add more olive oil if necessary. Cook the mushrooms with the spices for 4 minutes.
Make the Sauce: Transfer the cooked onion and garlic into the pan with the mushrooms. Add the flour and heavy cream. Stir to mix the sauce base and cook for 2 minutes on medium-low heat.
Mix the pasta: Combine the sauce and pasta. Thoroughly coat the pasta with the sauce. Slice the steak into chunky bite sizes and place them on the pasta. Garnish with sun-dried tomatoes and black olives to serve.