Look for plump, smooth bananas without bruises or spoilage. All bananas are picked green, so you don’t need to avoid unripe fruit. Avoid overripe fruit, however.
Ripen at room temperature for three to five days; fully ripe fruit is all yellow with small brown flecks and no green. Refrigerating the ripe fruit will darken the skin but not the flesh. Peel and dip in fruit juice to prevent browning.