A simple kitchen staple could keep lettuce fresh for up to a month, according to a chef and food experts. Lettuce often wilts before it can be fully used, but wrapping it loosely in aluminium foil may be the solution.
The aluminium foil trick
Chef Charles Kim, known on TikTok as Chef Fatty, shared the technique in a video from May. He said: "Did you know this lettuce is almost four weeks old? Here's my secret to keeping lettuce fresher longer."
No specialist equipment is needed — just a sheet of tin foil. The chef recommends washing the lettuce if dirty, drying it completely, and removing any yellow or deteriorating leaves before wrapping.
Chef Fatty explained: "Aluminium foil works because it's loosely packed, allowing for gases and moisture to escape. It's also not see through, which means light can't enter it."
Expert testing
Food specialists at All Recipes tested various lettuce storage methods and found that sealed bags or containers can either "choke" or dry out the vegetable. Michael Nestrud, who holds a PhD in Food and Sensory Science, said: "The biggest issue that happens with lettuce is that it either dries out or it gets wilted."
He added: "Sealing in a Ziploc chokes it because it needs CO2 to live, and the Ziploc will eventually have only oxygen. Leaving it open in your fridge with no cover will dry it out."
Results of the comparison
The specialists compared a romaine heart wrapped in tin foil with one left in its original plastic bag. Their findings showed that the foil-wrapped lettuce lasted beyond 30 days, while the bagged lettuce lasted only two to three weeks with wilting. They noted: "Every time you take a layer of lettuce off the heart, the 30 days practically restarts."
While there is no definitive scientific explanation, aluminium foil allows the lettuce to breathe better than a sealed container. Nestrud noted: "Aluminium does not, on its own, have any specific synergies with lettuce. If it's protective, it's either protecting it from drying out or it has just the right permeability to allow the lettuce to breathe without drying it out."
