Hot Beer Soup (Heisse Biersuppe)

Ingredients:
- 3 (12 ounce) bottles light beer
- 1/2 cup sugar
- 4 egg yolks
- 1/3 cup sour cream
- 1/2 teaspoon ground cinnamon
- 1/4 teaspoon salt
- fresh ground pepper

Directions:
- Pour beer and sugar into a heavy 4 to 5 quart saucepan.
- Bring to a boil over high heat, stir constantly until sugar is dissolved, then remove from heat.
- In a small bowl, whisk egg yolks and beat in the sour cream a little at a time. Stir about 1/4 cup of the hot beer into the mix then whisk it into the beer. Add cinnamon, salt and grindings of pepper.
- Return to heat and cook stirring constantly until it thickens slightly. Do NOT let it boil or it could curdle.
- Serve.