The graviola tree, or Annona muricata, produces the sweet soursop fruit, also called custard apple, paw paw or, in many Spanish-speaking countries, guanabana.

The tree reaches a height of 25 or 30 feet and produces large fruit that may reach a length of 12 inches.

Although its rind is quite bitter, the fruit's flesh is soft, smooth and sweet, and provides carbohydrate as its major nutrient.

Soursop also contains abundant vitamin C and several B vitamins such as thiamin, riboflavin and niacin, along with calcium, phosphorus and a small amount of iron