The custard-apple, also called bullock’s heart or bull’s heart, is the fruit of the tree Annona reticulata. This tree is a small deciduous or semi-evergreen tree sometimes reaching 10 metres (33 ft) tall and a native of the tropical New World that prefers low elevations, and a warm, humid climate. It is cultivated in many tropical countries, and also occurs as feral populations in many parts of the world including Guyana, Southeast Asia, Taiwan, India, Australia, and Africa.
The fruits are variable in shape, oblong or irregular. The size ranges from 7 centimeters (2.8 in) to 12 centimeters (4.7 in). When ripe, the fruit is brown or yellowish, with red highlights and a varying degree of reticulation, depending on variety. The flavor is sweet and pleasant, akin to the taste of ‘traditional’ custard.