Step 1

In a large pot, cook the spaghetti according to the package directions, adding the salt to the water once it is boiling. Drain the water and set the spaghetti aside.

Step 2

In a large skillet, heat the oil over medium heat. Add the salami and cook and stir until browned. Reduce the heat to medium-low. Add the onion, bell pepper, and garlic and cook, stirring occasionally, for 3 to 4 minutes, until the onion becomes translucent. Stir in the tomato, olives, bouillon, oregano, and black pepper. Cook for about 2 minutes. Stir in the tomato sauce and butter. Let simmer, covered, for 6 to 8 minutes, or until the sauce thickens slightly.

Step 3

Add the cooked spaghetti and stir to combine. Serve hot with the grated Parmesan (if using) on the side.