Passion fruit, or purple granadilla ('little pomegranate' in Spanish).

Passion fruit

Highly fragrant, egg-shaped and purple, red, or yellow when mature, the passion fruit is rich in vitamins A and C, potassium, and fiber -- with only 16 calories per fruit. Tasting a lot like guava, enjoy the passion fruit sliced in half, scooping out the seedy pulp. Or experiment: Serve it over low-fat yogurt, in fruit salads, or with chicken, pork, or fish. Strain the pulp and use it in juices, cocktails, desserts, and sauces.