The chirimoya is a tropical fruit that originated in South America. It is a species of Annona native to the Andean highland valleys. So priced that it is cultivated in parts of the world that have similar climates. Here too but with much difficulty because they will not bear fruit unless they are hand pollinated. That is why they are so pricey and very seldom found in markets here. I found them so abundant and inexpensive in Spain when in season. They usually come from the Canary Islands or the Azores if sold in Portugal.
The chirimoya is one of my favorite fruit. I find the white flesh so creamy and almost like eating custard with a fruity flavor. Mark Twain called the chirimoya "the most delicious fruit known to men."
To make the ice cream you need to remove the dark brown seed. They are very easy to dislodged with a fork. You need at least 2 cups of the delicately sweet and creamy pulp.
Beat a pint or 2 cups of heavy cream and sweeten it with at least 6 tablespoons of powdered sugar. Mix the pulp gently and freeze until firm.