Peel, halve and cut the onion in half rings.
Bake the sausages in brown for about 5 minutes and remove them from the pan.
Halve the apples from stem to crown. Divide the halves into 8 parts and cut out the core part of each part.
Add the apples and cook while stirring until the apples are soft. Add finely chopped sage, put the sausages in between the apples, and cook for a few minutes more.
Add a little more oil and fry the onion over medium heat for about 5 minutes until lightly colored.