2) Add rosemary, garlic, onions, carrots, celery, bay leaf and cook to soften 7 to 8 minutes more. Stir in tomato paste 1 minute then red wine, stir a minute more, add 375ml to 500ml stock and tomatoes and break up tomatoes with a spoon. Adjust seasonings, reduce 12 to 15 minutes and serve over polenta.
3) While sauce cooks bring remaining stock and milk up to a boil and whisk in polenta and cook for 2 to 3 minutes. Remove from heat and stir in cheese, a little salt and pepper, 2 tablespoons butter and parsley.
4) Scoop thickened polenta into shallow bowls and top with liberal amounts of ragu. Pass extra cheese at the table.