How Did Ancient People Keep Their Food From Rotting?

upstart writes in with an IRC submission for nutherguy:

How Did Ancient People Keep Their Food From Rotting?:

For quarantine cuisine, many of us are reaching deep into the kitchen pantry and freezer - recovering canned soups and frozen veggies, purchased who knows when. Though we may wonder, "Are these the same peas I used to ice my sprained ankle?" we're confident the contents are edible. Perishables last for years thanks to modern methods of preservation, such as freezing, canning, vacuum-sealing and chemical additives.

But how did ancient people preserve their foods?

It's a problem that every society, from the dawn of humanity, has faced: How to save food for figurative rainy days - away from microbes, insects and other critters eager to spoil it. Over the years, archaeologists have found evidence for a variety of techniques. Some, like drying and fermenting, remain common today. Others are bygone practices, such as burying butter in peat bogs. Though low-tech, the ancient ways were effective - clearly, as some of the products have survived millennia.

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