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Do I need a pressure cooker if I want to prepare grains?

Grains usually contain higher loads of bacterial endospores which are very hardy and which survive the temperature of boiling water, therefore a normal cooking process can't kill them.



Grains usually contain higher loads of bacterial endospores which are very hardy and which survive the temperature of boiling water, therefore a normal cooking process can't kill them. A pressure cooker is required, since the temperature in a pressure cooker is high enough to destroy the endospores.
Another, more time consuming method is the fractional sterilization. In this case, the jars fitted with a filter or a polyfil lid filter are boiled or steamed 212°F (100°C) for 30 min in a covered pot, three days in a row. Between the boiling steps the jars are best kept warm, around 30°C, to allow the remaining spores to germinate. The basic principle behind this method is that any resistant spores should germinate after the first heating and therefore be susceptible to killing during the second and third heating.

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