3What Are the Rusty Spots on Lettuce?
It’s a fairly simple explanation, really. The reddish-brown stuff that appears on your lettuce, often near the root, is what most professional chefs refer to as “rust.” It’s a pretty apt name once you think about it. Your case of “rusty lettuce” is due to an excess of moisture during the storage process. I promise, it looks worse than it actually is.
