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