custard apple The fruit of various species of tropical American trees of the family Anonaceae. Sour sop, Anona muricata, has white fibrous flesh and is less sweet than the others; the fruit may weigh up to 4 kg (8 lb). The sweet sop (A. squamosa) is also known as the ‘true’ custard apple, and is especially popular in the West Indies. The bullock's heart (A. reticulata) has buff‐coloured flesh. A 100‐g portion is a rich source of vitamin C and supplies 90 kcal (380 kJ).

custard apple See ANNONA.