For the onion spread, peel and dice potatoes and boil in salted water until soft. Cut bacon into small cubes and fry in a pan.
Dry on kitchen paper. Peel and dice onion and cook briefly in salted water. Rinse in a sieve and drain.
Wash apple, remove core and dice finely. Press potatoes and mix with sour cream until smooth.
Stir in bacon, onion, apple, caraway seeds and chives. Season the onion spread with salt and pepper.