Pollo alla Cacciatore, Hunter-Style Chicken

For tonight's dinner, I returned to La Cucina: The Regional Cooking of Italy for Pollo alla Cacciatore, Hunter-Style Chicken. There a a couple of recipes for Cacciatore in the cookbook, but this is our favorite.

Pollo alla Cacciatore, Hunter-Style Chicken
Ingredients-
2 tbsp. Unsalted butter
2 tbsp extra-virgin olive oil
1 medium onion, finely chopped
1 chicken, cut in pieces 
1/2 cup dry white wine
1/2 lb. Plum tomatoes, peeled and chopped (I used a can of crushed tomatoes)
1 red pepper; cleaned of seeds and chopped
Salt and pepper 

Method- Heat the butter and olive oil in a pan and add the onion. When it is golden, add the chicken pieces and let them brown. Pour in the wine, add the tomatoes and peppers, adjust the salt and pepper. Cover and cook at low heat until the chicken is cooked through, about 20 minutes.