2 Tablespoons extra virgin olive oil, divided
1 pound
Italian sausage (bulk)
1 medium onion, chopped
2 garlic cloves, roasted
One 28 ounce can diced tomatoes
1/2 cup dry red wine, such as cabernet sauvignon or merlot
2 Tablespoons balsamic vinegar
2 Tablespoons tomato paste
1 teaspoon sugar
1-1/2 teaspoons fresh oregano, chopped
Salt and freshly ground black pepper
6 cups water
3/4 cup calamata olives, pitted and chopped
1-1/2 cups polenta
4 Tablespoons unsalted butter
1 teaspoon fresh rosemary, chopped
3/4 cup parmigiano-reggiano cheese, grated
6 rosemary sprigs for garnish