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She bought some tinned semolina so her children could try - and it didn't go too badly.

Much of what most of us eat is processed, from tinned vegetables to bread and milk.

"We're living on tinned vegetables and microwave dinners," she told me.

The family carried their clothes, some cans of tinned food, and a few personal possessions.

No longer delivered "on the hoof" to cities, cattle were now slaughtered in Chicago and sent East as tinned meat or, after the 1870s, in refrigerated railcars.