In the meantime, sauté the finely diced onions in a little fat until they are blond. Add the chopped corned beef and cook with the lid on for about 3 minutes. Then add the diced pickles with some of the cucumber stock. Season savory with salt, pepper and allspice. If desired, add a little more diced beetroot. Let everything simmer gently for about 10 minutes.
Mash the cooked potatoes a little, but not as fine as for puree! Stir in the corned beef mix. If the mixture is too firm, stir in a little more cucumber water.
Fill on plate. Serve with a fried egg and, if you like, with herring, herring or rollmops.