The sugar-apple, sweetsop, or custard apple is the fruit of Annona squamosa, the most widely grown species of Annona and a native of the tropical Americas and West Indies.
The fruit is spherical through conical, 5–10 cm (2.0–3.9 in) in diameter and 6–10 cm (2.4–3.9 in) long, and weighing 100–240 g (3.5–8.5 oz), with a thick rind composed of knobby segments. The color is typically pale green through blue-green, with a deep pink blush in certain varieties, and typically has a bloom. It is unique among Annona fruits in being segmented, and the segments tend to separate when ripe, exposing the interior.
The flesh is fragrant and sweet, creamy white through light yellow, and resembles and tastes like custard. It is found adhering to 13-to-16-millimetre-long (0.51 to 0.63 in) seeds forming individual segments arranged in a single layer around a conical core. It is soft, slightly grainy, and slippery. The hard, shiny seeds may number 20–40 or more per fruit and have a brown to black coat, although varieties exist that are almost seedless.