Freezing Pears See my page on how to freeze peaches, plums, nectarines, figs and cherries. Potassium is necessary for maintaining heartbeat, muscle contraction, nerve transmission, and carbohydrate and protein metabolism. Asian pears can be stored but may develop a strong, wine-like taste if kept too long. Marks on the Pears: Also when green skin color Asian pears ripe to change to yellow, they're ripe. If pears are picked before they are fully ripe, they Asian pears ripe be ripened at a temperature of 60 F to 70 F.