How To Thaw Frozen Blackberries in the Fridge
This method is best if you want to eat the blackberries whole. They will be softer and juicier than before they were frozen, but their taste will not change. You can also use this method to defrost a sweetened pack.
A towel OR paper towel
Place the berries in a colander/strainer and rinse them thoroughly under cold tap water. Shake off as much excess water as you can.
Pat the blackberries dry with a clean towel or paper towel.
Pour the cleaned blackberries in a bowl, cover it with plastic wrap, and put it in the fridge.You can take the sweetened pack container and put it directly in the fridge, too.
Leave the blackberries to thaw in the fridge for at least 6 hours. Alternatively, you can leave them in the fridge to defrost overnight.