A pitaya /pɪˈtaɪ.ə/ or pitahaya /ˌpɪtəˈhaɪ.ə/ is the fruit of several cactus species indigenous . "Strawberry pear; In: Fruits of warm climates". Center for New Crops & Plant Products, Purdue University, Department of Horticulture and Landscape Architecture. Ly Pear Cactus Fruits Turn Bright Red And Form About A Month 20 Exotic Spanish Fruit Names You Ll Encounter In Latin America -> Source. In late summer in Mexico, prickly pear cactus fruits, or tunas, are can use it just about anywhere you'd use an apple—in salads, for example.