Beet soup (Barszcz czerwony)

Ingredients:
1 stick butter
5 beets
1 onion
Salt & pepper to taste
2 tbsp. vinegar
1/2 cup sour cream (optional)

1. Bring 1 1/2 quart water to boil.
2. Add butter.
3. Add peeled and grated onion and beets.
4. Cook approximately 1/2 hour until beets are cooked.
5. In a soup bowl dissolve 1/2 cup sour cream with some liquid from your soup then add it to the cooking pot. Continue to heat soup thoroughly but do not boil. Enjoy!