When buying green or gold kiwis, choose plump, fragrant fruit that yields to gentle pressure. Unripe fruit has a hard core and a tart, astringent taste. If only firm kiwis are available, ripen them for a few days before eating them. Baby kiwifruit should be purchased firm and eaten that way.
How to Ripen Kiwis
To ripen green and gold kiwis, place them in a paper bag with an apple, banana, or pear, and let stand a day or two at room temperature.