For starters, clean the potatoes, cut small cubes, pour cold water and put to cook.
Сarrots to grater, chop the onion.
In the pan, dissolve the butter, fry the onion until transparent, add carrots, and all together fry until soft.
After 15 minutes of cooking potatoes add to the pan fried onions and carrots, salt, cook vegetables for another 10-15 minutes.
When the potatoes are ready, remove the soup from the stove. I used a blender (nozzle for making mashed potatoes). It turned out very delicate consistency without a single lump. Now put the pot again on the stove, doda Slivki, add favorite spices, I added black pepper, and allow to boil.
Serve soup with herbs and croutons, you can add sour cream.