In the meantime, while the squash is roasting, prepare the meat sauce. Preheat one tablespoon of olive oil in a skillet over medium high heat. Add the italian sausage and cook until browned,about 5-7 minutes. Then, add in the onions and minced garlic and cook an additional 3-5 minutes, until the onions are translucent and fragrant. Add the diced tomatoes, spices, salt and pepper. Bring to a simmer and cover with a lid, cooking for about 10 minutes, stirring occasionally. Taste and adjust seasoning to your liking.