Prepare the vegetables. Heat the vegetable oil in a frying pan, add the onion. Fry it until golden brown for 5-7 minutes, then add the carrots. Stir and leave to simmer for 5 minutes. Add the cabbage to the vegetables. Salt, pepper and stir.
Prepare the sausages, combine them with the vegetables and simmer. In a separate container, fry the sausages until golden brown for 2-3 minutes. Then add them to the vegetables. Pour in the broth, add the bay leaf. Cover the pan with a lid. Simmer the bigos until the cabbage softens for about 15-20 minutes.