Questions & Answers about In die oop vrieskas ontdooi die vleis en bederf die kos.
Because Afrikaans is a verb-second language in main clauses.
Here, the sentence begins with the place phrase In die oop vrieskas. Once that comes first, the finite verb must come next, so you get:
In die oop vrieskas ontdooi die vleis ...
If you start with the subject instead, you get the more basic order:
Die vleis ontdooi in die oop vrieskas ...
So ontdooi is before die vleis because the sentence does not begin with the subject.