Rare Sugar Apple Red Kampong Mauve Variety. The sugar apple is an exquisite fruit that is very closely related to the cherimoya. The fruit are typically baseball to softball size, and they taste like sugary sweet custard. The pulp comes apart in segments each containing a small black seed that separates easily from the fruit. The trees begin to fruit at just one to two years of age, and they can easily be maintained at eight to ten feet for container growing in colder climates. Fruits are extremely sweet and taste like a sugary custard.