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Families preserve food for all kinds of reasons. You may want to waste less food. Save leftovers. Buy groceries in bulk when prices are low. Preserve produce from a garden. Make weeknight meals easier. Store seasonal foods. Prepare for emergencies....

Fermented foods have a shelf-life problem that canning and refrigeration don't solve well — they keep changing. A freeze dryer solves it differently: instead of slowing the ferment down, it stops it, right at the point you like best. Fermentation...