Remember when frozen food meant a sliver of brown meat called Salisbury steak served on a compartmentalized tray with squares of corn, mashed potatoes and a brownie that always crumbled when you tried to take it out of its plastic pocket?These TV dinners still exist, but the world around them has changed — drastically. A time-lapse camera over the last 25 years in a typical supermarket would show a steady expansion of the frozen section, growing from a single aisle, or perhaps a singlecoffin cooler, to today's multiple aisles with end-unit displays.
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