Onions peel and chop finely. Knead minced meat, egg, breadcrumbs, half of the onion cubes and mustard. Season with salt and pepper. Make about 20 small balls from the mixture. Heat 1 tablespoon of oil in a large frying pan. Fry the meatballs at medium heat for about 8 minutes, turning them over and taking them out.
Pour the beans into a sieve and rinse. Clean the chilli, cut lengthwise, wash and remove the seeds. Cut the pod into small pieces. Cut chorizo into pieces of about 2 cm. Heat 1 tablespoon of oil in a saucepan. Fry the chorizo in it over a high heat for about 1 minute. Reduce heat.
Add the remaining onion cubes and fry until transparent. Add chilli and tomato paste and fry for about 1 minute, stirring continuously. Pour in the stock. Add beans and meatballs to the pot and simmer for about 10 minutes. Season to taste with salt and pepper. Wash parsley, dab dry and chop. Sprinkle stew with parsley