Sweat the flour in the butter and deglaze with boiling water, add the rice and season with Vegeta, salt and pepper. Cook until the rice is cooked through.
Now whisk the egg with the yogurt in a bowl, then add 1 ladle of the hot soup to the yogurt mixture and mix. Then add the whole thing to the soup while stirring and take it off the stove straight away.
Mash the peppermint well in your hand, remove any small stalks and add to the soup.