Steam the onion and carrot pieces in the hot oil until they are translucent, but do not brown. After about 5 minutes add the potato pieces and fry them.
Add the washed lentils, salt and boiling water and stir. Cook everything until soft for about 30 minutes.
Then chop up completely with the hand blender or pass through a sieve. Possibly add a little more salt.
Froth the butter and add the tomato paste and paprika powder (I like to use hot or chilli flakes - Pul Biber).
Add the mint and bring everything to a boil. Pour over the hot soup, stir briefly and serve.