On an April afternoon in California’s lush Salinas Valley, a group of crop-pickers watched as a small, refrigerated truck approached their field. The truck parked, and out hopped six people. The workers looked on in shock as the team of mystery benefactors handed them bag after bag of fresh, chilled produce—strawberries, broccoli, lettuce—free of charge. “The first one was a tearjerker on both sides,” says Melissa Kendrick, executive director of the Food Bank for Monterey…