An oxymoron is a figure of speech that combines contradictory words with opposing meanings, like “old news,” “deafening silence,” or “organized chaos.” Oxymorons may seem illogical at first, but in context they usually make sense. Link
I love writing about this kind of topic, it demonstrate the literary terms that we have. Sweet and sour is usually tagged as oxymoron, I have taken the time to define oxymoron above.
It is simply putting two opposite in meaning words side by side in a sentence. And the sentence still demonstrate what it ought to demonstrate in a sentence, the use of these words being out meaning of the words in the sentence.
Having Sweet and sour together in a sentence can be confusing for some but it is a very good way to express yourself.
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Thank you for sharing.