If you've accidentally opened an unripe durian, there are a few steps you can take to try and salvage the situation:
1. Refrigeration: Place the unripe durian flesh in an airtight container and store it in the refrigerator. The cool temperature can slow down the ripening process and may help the fruit to mature more evenly.
2. Ripening Process: To speed up the ripening, you can place the durian flesh in a paper bag with an apple or banana. These fruits release ethylene gas, which can naturally ripen the durian faster. Keep the bag at room temperature away from direct sunlight.
3. Check Regularly: After a day or two, check the durian for signs of ripeness. It should start to soften and develop a stronger aroma.
4. Freezing Option: If the durian is still too hard and you prefer not to wait, you can freeze the flesh. Frozen durian can be enjoyed as a dessert or allowed to thaw slightly for a creamy texture.
5. Culinary Uses: Unripe durian may not be ideal for eating fresh, but it can be used in cooking. Consider using it in savory dishes or desserts where the texture and flavor can be complemented by other ingredients.
Remember, patience is key when dealing with unripe durian. With a bit of time and the right conditions, you may still be able to enjoy its unique taste.