Sopa de Arroz con Menta (Chicken Soup with Rice and Mint)

This is a typically Andalusian dish.  My mother used to put mint in soup when I we feeling a bit ill, the tastes is very nostalgic.  Ideally one would use self-made chicken stock, but using pre-made stuff is alright if you don't have the time.  You may also omit the chicken if you just want something to quickly warm the soul.

Ingredients
Serves 4

1 liter chicken broth
2 tablespoons rice
150 ml plan yogurt (small container)
1 egg yolk, slightly beaten
1 cup cooked chicken (can be omitted)
butter
fresh mint, chopped

Put the chicken broth in a pot and bring to a boil, add the rice and boil slightly until rice is cooked, about 15 minutes.  In a separate saucepan, mix yogurt with flour and egg, slowly add 2 cups (250ml) water and bring to a boil, once the mixture is boiling, pour into large pot of chicken broth.  Let the soup simmer an additional 5 minutes.  Add the cooked chicken and heat through.  At the end, place a small pad of butter and a teaspoon (can be a little more if you like) of the mint in a bowl and ladle in the soup.  Enjoy...