Cook the rice in the stock for 15-18 minutes until tender.
In a bowl, mix the yoghurt smooth with the egg yolk and flour.
Stirring constantly, pour a ladleful of the hot soup into the yoghurt mixture to warm it through (this prevents curdling).
Pour the yoghurt mixture back into the soup, stirring, and bring to the boil over low heat, continuing to stir, then cook for 3-4 minutes. Season with salt.
Melt the butter in a small pan, stir in the mint and pul biber, and heat for 30 seconds.
Ladle the soup into bowls, and drizzle the mint butter on top.
A Receptnaptár original recipe. Calories and protein are estimated.