Meanwhile, make the bolognese sauce. In a large nonstick skillet, heat the oil over medium heat. Add the sausage and cook, breaking it up into small pieces with a wooden spoon, until cooked through, about 3 minutes. Add the onion and carrot and cook, stirring often, until softened, about 5 minutes. Add the garlic and cook, stirring, for 30 seconds. Add the turkey and 1 tsp. salt and cook, breaking up the meat into small pieces with a wooden spoon, until cooked through, about 5 minutes. Stir in the marinara sauce. Season with ½ tsp. black pepper and the oregano. Reduce the heat and simmer, stirring occasionally, for 15 minutes. Adjust the seasonings if necessary.