Blackberries are an interesting fruit since they are not as durable and firm as the blueberry. They are also hard to keep once they have been picked because of how soft they are. But the blackberry is delicious and is very good for you. Maybe you have some blackberries that you luckily found in the supermarket but they don't seem ready to eat yet, or maybe you found them along the road while out for a walk. If you need to ripen your blackberries, you will have to do it fast since they do not hold up for very long.
Place the unripened blackberries in an airtight container and place a small apple inside with them. Apples give off a natural etheylene gas that ripens other fruits quickly. Place the container in a cool dark place, such as a cellar or basement. Allow the blackberries only 24 hours to ripen. Blackberries by nature are very soft and you do not want them to become too ripe or they will get squishy and bleed.
Place blackberries in a fruit bowl and let them sit out on the counter overnight. The open air will allow them to breathe easily, helping them to age quicker. Keep in mind that blackberries are by nature a very soft fruit and if they get too ripe and too warm they will bleed.
Cut the stem from the blackberries and wash them gently. For approximately 2 cups of blackberries, you want to place them in an airtight container and add a tablespoon of apple juice and a dab of lemon juice, then put in the refrigerator. Cutting the stem will allow for the apple juice to age and soften the blackberries, but the lemon juice will preserve the flavor.
Place blackberries that are still very green and hard in a brown paper bag and seal well. Leave the paper bag on the counter and check the blackberries in 24 hours for ripeness. Continue to check them every 24 hours for progression. Keeping the blackberries sealed in a dark place will help with aging.