I have yet to try this, but a friend found the idea on pinterest. You can prepare salads for the week (well, up to 4 days) to take to work, or just to have ready. You put salad dressing in first, then the toppings, with the lettuce on top so it doesn't get soggy. You're supposed to just be able to mix it up and eat it, but she found you had to dump it out onto a plate to really get it mixed well. What a great idea!