Carefully place green tomatoes in a single layer in a cardboard box or paper bag. Place a ripe banana next to them. It is the banana that can help the tomatoes ripen faster.
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Ripe bananas release natural gases – ethylene, which participates in the ripening process of fruits and vegetables. In a closed, but not airtight box or bag, the concentration of ethylene around the tomatoes increases, so they start to change color and ripen faster.
A cardboard box or paper bag helps retain the necessary gases, but at the same time allows excess moisture to escape.
For ripening to proceed smoothly, temperature is also important. Tomatoes are recommended to be stored at about 18–22 degrees Celsius, in a dry and darker place.
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Unripe tomatoes should not be placed in the refrigerator. Low temperature slows down the ripening processes, so tomatoes can become watery, lose flavor, and remain pale.
So, if you have green tomatoes on the windowsill or in a box, just place a ripe banana next to them and create the right conditions – ripening can speed up significantly.