If you are looking for advice on canning caponata, take a look at this earlier Hotline question https://food52.com/hotline/7668-canning-caponata-water-bath-or-pressure-can
I would just put it in, stir occasionally, until hot to the touch. If you have a microwave oven, I would use that, microwaving in short increments and stirring until it is to your liking.
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