I assume they mean dextrose (corn sugar). I've not tried any methods of cooking sugar, but the problem is the recipes. If you've got a beer made with a large proportion of simple sucrose or dextrose instead of complex sugars found in malted grains, you're going to end up with a thin "cidery" beer. There are a few styles that benefit from simple sugar additions, but most of the cheap kits are doing it just to keep down costs.
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