Annona mucosa, commonly known as the custard apple or the sweetsop, is a tropical fruit-bearing tree native to the Caribbean, Central America, and northern South America. It belongs to the Annonaceae family, which also includes other well-known fruit trees like the soursop (Annona muricata) and cherimoya (Annona cherimola).

The custard apple tree can reach heights of up to 10 meters (33 feet) and has large, glossy, dark green leaves. The fruit it produces, also called custard apple or sweetsop, is oval to heart-shaped, and its size ranges from 7 to 12 centimeters (2.8 to 4.7 inches) in diameter. The skin of the fruit is thin and yellowish-green, with a bumpy or lumpy texture.

Inside the custard apple fruit, there is a creamy, white, sweet, and aromatic flesh. The flesh is divided into segments, and each segment contains a dark brown or black seed. The flesh has a custard-like consistency, hence the fruit's name. The flavor is described as a combination of pineapple, banana, and strawberry, with a hint of vanilla.

Custard apples are typically eaten fresh, scooping out the flesh and discarding the seeds. They are enjoyed as a sweet and refreshing treat, often chilled. The fruit can also be used in various culinary preparations such as desserts, smoothies, ice creams, and fruit salads.

Besides its pleasant taste, custard apple is also known for its nutritional benefits. It is a good source of vitamins, particularly vitamin C, and provides dietary fiber, potassium, magnesium, and several antioxidants. It is important to note that while custard apples offer health benefits, they are also relatively high in natural sugars and should be consumed in moderation as part of a balanced diet.

Overall, Annona mucosa, or custard apple/sweetsop, is a tropical fruit with a creamy, sweet flesh that is enjoyed for its unique flavor and used in various culinary applications.