Jar Method – For Cherry and Grape Green Tomatoes

Remove all of the twigs, stems, leaves, or vines that might be attached to the tomatoes.
Wash and air dry the tomatoes.
Place about four or five small tomatoes in a jar that has a firm fitting lid, like a Mason jar or a crock.
Place a ripe or ripening banana inside the crock or jar and close it firmly. Make sure the jar or crock is not filled too tightly, mashing the tomatoes and the banana too closely together can cause bruising or molding.
Place the jar or crock containing the green tomatoes and the banana in a warm and preferably semi-humid location that does not get direct sunlight.
Check the progress on the ripening of the green tomatoes daily to make sure there is not any rot developing. You may have to replace the banana once during the processing.
It will take about one week to 14 days for the tomatoes to fully ripen.

This method works great if you have small or just a few tomatoes that need to ripen.