Uncle Mike's Bolognese Meat Sauce

6 Tbls. Butter
2.5 Tbls. olive oil
1 finely chopped onion
1 finely chopped carrot
1 stalk finely chopped celery
1 finely chopped bell pepper
2/3 c. finely chopped bacon
3/4 cup ground pork
3/4 cup ground beef
1/4 cup sausage meat
2-3 chicken livers (optional)
2/3 cup dry white wine
fresh garlic, salt and pepper & Italian seasoning to taste
4 tsp. tomato paste
1.25 cups beef stock
4 Tbls. cream or milk

Heat half the butter and all the oil in a deep frying pan.  Add onion, carrot, pepper, celery and bacon and fry until veggies soften.  Add remaining meat and fry until browned.  Moisten with wine and cook until it evaporates, then season.  Dilute tomato paste with some stock.  Stir into sauce, cover & cook slowly, gradually adding remaining stock. 

After sauce has simmered for 1.5 hours, add cream and cook until reduced.  Add remaining butter.

At the last moment another option is to add 1/4 lb sauteed finely chopped mushrooms.