I always thought that custard apples needed to be cooked, or tasted like custard, or were maybe used to make custard(?). It was also their ugliness that kept me away.
It’s simple to eat them, actually. You just wait until they’re very ripe. Cut open. And eat with a spoon! (Don’t eat the seeds). And if their delicious sweetness isn’t enough, this should convince you to grab one when you’re next at the market:
“Custard apples are a well-balanced food having protein, fibre, minerals, vitamins, energy and little fat. They are an excellent source of Vitamin C, a good source of dietary fibre, a useful source of Vitamin B6, magnesium and potassium, and with some B2 and complex carbohydrate.”
In Australia they’re available fresh from March through to October.