Pale green beans will be sweeter and meatier when cooked though more fibrous and less delicate. Dark green beans are best suited for braising as they are more firm. Avoid mature beans that can turn yellow or whitish colored.
Long beans are low in calories, about 45 calories per cup, and rich in vitamin A and also contain vitamin C and potassium.
Treat Long beans as you do for French or green beans. Store in a plastic bag and place inside the refrigerator set at optimum humidity where they stay fresh for 2-4 days. Mature long beans can be harvested for their seeds which can be dried and stored like other dry beans.