As far back as the 1920s, Clarence Birdseye, of Birds Eye fame, developed a system for fast-freezing, a true industry pioneer. But it wasn't until the 1950s, when domestic and commercial freezers became more affordable, that frozen food became popular. It's as nutritious as fresh, helps prevent food waste and is a godsend for large and small households alike. Here's our list of the greatest frozen foods of all time, with tips on how to use them.