Finely chop the onion and celery.
Cut the sausage into bite-sized pieces.
Heat olive oil in a pan and sauté the onion and celery.
Add the sausage and cook until browned.
Add sliced potatoes and kidney beans.
Pour in tomato sauce and chicken stock.
Season with salt and pepper to taste.
Cover with a lid and simmer over medium-low heat for 10 minutes.
Finish by sprinkling parsley on top.