Questions & Answers about К борщу подают сметану.
That is a very common question.
In this sentence, к борщу means with borshch / as an accompaniment to borshch. Russian often uses к + dative when talking about something that goes well with, is served with, or is intended for another food or drink.
So:
- к борщу = with borshch
- not movement here, even though к often means to/toward
Similar patterns:
- к чаю = with tea
- к мясу = with meat
- к рыбе = with fish
So this is an idiomatic food-serving pattern, not a literal direction.
Because the preposition к requires the dative case.
The base form is:
- борщ = borshch
After к, it becomes dative singular:
- к борщу
So the change is happening because of the preposition, not because of the verb.