Varies greatly according to product and preparation. Store them in a paper bag with apples, which give off the ethylene gas that accelerates ripening. The cold will kill cells in the skin and make it brown, but the banana inside will stay fresh for several more days. Salad is a standby vegetable course or main meal when you cook for one. The meal is merely assembled on the plate, and cleanup is minimal.
Iceberg lettuce keeps longer than other types.
Store for up to two weeks unwashed in a sealed plastic bag with a paper towel until ready to use. Never store unwrapped lettuce near ethylene producing fruits like apples, bananas and pears, because ethylene speeds up decay in lettuce. Leaf lettuces should also be stored unwashed in a plastic bag, but they will keep for only about a week. Onions give off gasses that alter the flavor of the potatoes and the potatoes' moisture makes onions sprout. Prolonged exposure to light causes potatoes to be tinged with green.