In a large sauté pan, add oil and sausage and cook for 4-5 minutes. Add green onions, mussels and arabiatta sauce. Cover the pan and cook for 5-6 minutes until mussels have opened, then serve in four equal portions with two slices of bread.
In a medium sauce pan, heat olive oil over low heat. Add garlic and cook until garlic is light gold. Crush tomatoes by hand (with juice) and add tomatoes to pan. Add olives, capers, kosher salt, and red pepper flakes. Simmer gently over moderate heat for 20 minutes. Adjust seasonings and add chopped parsley and oregano. Stir to combine and enjoy!