So, I think it must be time for another bread soup recipe: the Sourdough Soup! This is a Czech recipe and I found it in this book:
I made the soup last autumn, when the first really cold days set in, and that’s the kind of weather this kind of soup is perfect for. Not really suitable for spring, definitely not for summer, but I just checked the weather forecast and hurray, hurray, it’s going to rain tomorrow! Phew, I thought I’d have to wait another six months before I could tell you about this.
Kvasovka (“Kvas” means sourdough)
1 large onion, diced
1 tbsp caraway seeds
3-4 tsp salt
1/4 l rye sourdough (starter)
1/8 l cream or milk
2 eggs, whisked
Bring the water to a boil, add the salt, and then the onion and caraway seeds. These should boil for about 10 minutes, then whisk in the sourdough. Let the soup cook for another 5-10 minutes on low heat, stirring continously. Then whisk in the cream or milk and the eggs. Best enjoyed with boiled or baked potatoes.