Melt the butter in a saute pan. You can also substitute butter for olive oil to make a lighter version, or use a combination of both. Once melted, add the garlic and chopped onions. When onions are translucent, add the Pork Sausage. Cook for about 8-10 minutes until the sausage looks done. Add in the chopped green onions and mushrooms. Cook until the mushrooms are done, about 5 more minutes.
Boil your spaghetti to al-dente, in parallel of this fantastic sauceless-sauce.
Then enjoy with some grated parm-reggiano cheese and top off with a glass of wine!