No doubt you've seen the memes mocking the frustrating cycle of buying fresh greens only to throw them out, uneaten, a week later before replacing them with a new bag. You can even purchase cocktail ...

So, you bought a bag of salad and it’s wilted within a week — what gives? It’s a tale as old as time — or, since the inception of bagged lettuce — that has frustrated health-conscious grocery shoppers ...