Stir together all spices, salt, and pepper in a small bowl. Sprinkle evenly over meat and rub in to coat all sides and pieces.
Heat olive oil in a large skillet over medium high heat. Add the steak and cook, turning as needed to brown all sides, for about 5 minutes until browned and mostly cooked through. The time it takes will depend on the thickness of your cut. Remove to a plate.
Add onions, peppers, and garlic to the pan and cook, stirring occasionally, until cooked through and browned, about 5 minutes. Remove from pan and place with the steak.
Add the tomatoes, stock or water, and pasta to the pan. Boil, stirring occasionally, until the pasta is cooked through, about 8-12 minutes. There will still be some liquid in the pan (this is your sauce).
Return the meat and peppers to the pan with the pasta. Stir in sour cream. Cook over low heat just until the sour cream is distributed through the sauce and all the components are hot. Serve immediately.