How can you fix peanut brittle that did not harden?

You can't save a batch that didn't harden. It needs to be cooked long enough to change color. Light to medium brown.

The rescipe I use calls for a mixture of soda and margarine to be mixed in at the last before spreading the mixture to harden. Good luck My batch I thought was brown enough and thin enough...turned out I was wrong although it did harden it was just too sticky. I took each broken peice put it on parchement and cooked on high in microwave for 40 seconds.

Turned colour and came out perfect. I also dusted it with the tiniest bit of baking soda before cooking again.

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