Overcooked grape jelly

I had a similar problem a few months ago when I had trouble with a half batch of a lemon chutney recipe I've made too many times to count.
Mrs Wheelbarrow advised (quoting roughly from memory) it was the small volume that caused the caramelization...small batch doesn't take as long to cook and the sugar gets too hot too soon.
What to do?
She advised, for futures, not to make half batches.
For the current batch, eat it as a snack, or on ice cream or wherever it's palatable.