Michael, it depends on how sour your cider was originally. It's always a good idea when reducing things to have a small plate next to the pot on the stove for testing. Put a teaspoon of the liquid on the plate and let it sit for a minute; then you can see what it's consistency is going to be like when cooled. If it doesn't taste bitter or burnt, the sour notes you're getting could be from cider that was getting ready to turn or was more acidic to start with. Susan

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