But rather than tossing them straight into the trash, I thawed them. This time, my salmon and chicken, along with leftover cooked brisket and an old tray of sushi, were destined for a food dehydrator.

Heather Billings, food waste reduction consultant. Credit... Supported by By Somini Sengupta Photographs by Cassandra Klos America has a food waste problem: Rotten tomatoes and pizza boxes end up ...