Add the sausages and cook until browned, about 2 minutes on each side.
Remove most of the fat then add the onions, garlic, green pepper, red bell pepper, tomato paste, wine (or apple juice), fennel seeds and salt and pepper to taste.
Reduce heat to medium-low, cover and cook for 25 minutes.
This can easily be scaled down to feed 2, just cook up less sausage.