Zabelka refers to Russian traditional name of different milk condiments or products that is used or added for cold and hot soups, as in milk, cream, clabber, sour cream.

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Other definition:
Zabelka refers to Russian traditional generic name for dairy products (zhapravka such as sour cream, milk, cream, etc.) that is added to soups or additions to soups, as in the addition of sour cream to borsh