Nothing compares with truly fresh salad greens. If you think you wouldn't be able to tell the difference between a bag of pre-washed lettuce preserved with a blast of gas and a head of just-picked lettuce from a farmers market, try a side-by-side comparison. The delights of truly fresh lettuce are one of the greatest taste advantages to eating locally.
What Lettuce to Buy
Remember that the best lettuce is whole-head or cutting lettuces that are harvested and sold as-is with as little processing as possible.
If you're tempted by the "pre-washed" or "triple-washed" claims on bagged lettuce, a test done in Minnesota, where the lettuce variety with the least bacteria was the plain, unwashed head of lettuce. Bagged lettuce is often rinsed in a chlorine wash and handled by many people before being sealed. That 2010 test by Consumer Reports found levels of bacteria in "pre-washed" and "triple-washed"bagged lettuce that most of us would want to avoid.
When to Buy Lettuce
Lettuce in general is a cool weather crop that bolts and turns bitter when faced with harsh heat. We've become used to eating lettuce year-round because it can be cultivated somewhere all year, but local harvests are seasonal. Look for lettuce all year-round in the most temperate regions, in spring and fall in warmer areas, and in late spring through summer in cooler climates. Tougher, pleasantly bitter chicories are available in the fall and early winter.
What to Look For
You want lettuce picked as recently as possible. Look for clean, fresh looking cut ends. You don't want anything that looks rusty, dried-out, or wilted. Crisp, bright looking leaves are good too. Remember, though, that some spotting or holes is common, especially in crops raised without sprays. Ask the grower if you have any questions about how the lettuce looks.
How to Store Lettuce
As soon as possible after you bring lettuce home, throughly clean and dry it. Roll the leaves in several layers of paper towels or a clean kitchen towel, seal in a plastic bag, and store in the hydrator ("crisper") of your refrigerator for up to 1 week. Lettuce stored this way stays crisp and wilt-free, since it is kept hydrated by the slightly moist towels, but basically dry by the towels soaking up excess moisture.
How to Use Lettuce
Ages ago, lettuce was always cooked - mainly into soups. Now, of course, "lettuce" is almost synonymous with "salad" and the vast majority of lettuce grown and sold is eaten raw, tossed in salads or as the bed for another salad.
Sounds simple enough, right? Well, maybe. There is an art to making a great salad: Use fresh greens, toss them lightly but thoroughly, make a great dressing.