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You boil them in a pressure cooker at 11 pounds and 240° F. for 25 minutes. You can make a vacuum and seal the jar at a lot lower temperature, but when cooking beans, a consideration that's more important than the vacuum is the concern for botulism. Botulism can actually grow in a vacuum. That's why the temperature, pressure, and cooking time have to be right. There's a great web site about canning beans at the link below.

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