3) Use your
sense of smell. If you cannot smell anything from the fruit,
it is probably unripe. If you detect an overly strong, fermented
odour, the durian is probably overripe. You should be able to
detect the bitter-sweet aroma of a deliciously ripe durian.
the weight of the durian. If it's light, then it's likely to
be ripe and vice versa.
the durian. If you can feel or hear movement of its contents,
then it's most likely to be drier and hence fresher.
the durian shell with a knife. A hollow sound indicates its
ripeness. Too hollow, and it may be overripe. A solid sound
means its unripe.