Green Beans

Green beans keep about a week refrigerated. Store them unwashed in a perforated bag in the crisper — washing before storage is the single fastest way to ruin them.

They need humidity but not standing water. A paper towel in the bag absorbs condensation while keeping the environment humid.

Do not trim the ends until you cook them. Every cut is a wound that loses moisture and admits bacteria, and trimmed beans go limp and spotty noticeably faster.

Keep them away from apples and other ethylene sources; green beans are moderately ethylene-sensitive and develop russet spotting on exposure.

Green beans freeze very well once blanched, for about 12 months, and blanching is worth doing — unblanched frozen beans lose color and develop off flavors from enzymes that remain active.

A green bean is an immature seed pod, harvested long before the seeds develop, and it is essentially a water-filled tube — around 90% water held under turgor pressure.

That is why the primary quality signal is the snap. A fresh bean breaks cleanly with an audible crack because the cells are fully turgid; as it loses water the pod becomes flexible and bends instead of breaking. Limpness is dehydration and is a quality issue, not a safety one.

Because the pod is immature tissue with a thin cuticle, it loses water fast and is vulnerable to surface bacteria. Washing before storage leaves a film of moisture on that thin skin, which is precisely what soft-rot bacteria need — hence the rule against it.

The brown or rust-colored spotting that appears on aging beans is a combination of ethylene exposure and localized cell breakdown. Light spotting is cosmetic; extensive dark spotting means the bean is going.

Discard beans that are slimy, mushy, or dark and wet, or that smell sour. Beans where the seeds have swelled visibly through the pod are simply over-mature — tough and starchy rather than unsafe.

Raw green beans contain small amounts of lectins and are best cooked rather than eaten in quantity raw.