Also known as the Purple Granadilla

Passion Fruit is the fruit of a perennial climbing plant native to the Amazon forests in Brazil. It is a heavenly scented fruit, and it is ripe when the dark purple skin is deeply dimpled and the fruit is juicy. It is used to make preserves and ice creams and is pureed for pastry flavorings. The nearly round or ovoid fruit, 1-1/2 to 3 inches wide, has a tough rind that is smooth and waxy and ranging in hue from dark purple with faint, fine white
specks, to light yellow or pumpkin-color. Within is a cavity more or less filled with an aromatic mass of double walled, membranous sacs containing orange-colored, pulpy juice and as many as 250 small, hard, dark brown or black, pitted seeds. The unique flavor is appealing, musky, guava-like and sweet/tart to tart. The yellow form has generally larger fruit than the purple, but the pulp of the purple is less acid, richer in aroma and flavor, and has a higher proportion of juice (35-38%). Numerous hybrids have been made between purple and the yellow passion fruit, often yielding colors and other characteristic intermediate between the two forms.

Here are some good links to more passion fruit information:
http://www.donellis.com/fruit-passionfruit.html

http://www.aloha.com/~ritt/2/uncommon.htm#passionfruit

http://www.caribbeanfruit.com/english/imaracuya.html

http://www.webtender.com/db/ingred/421