Also known as the Chinese date or red date, the jujube is a type of tree native to China. The fruit of the jujube tree is typically reddish in color, and oval or globe-shaped. The fruit reaches up to 2 inches in diameter, with smooth skin and a single stone. The fruit is often dried and used in herbal remedies. Research on the nutritional and culinary uses of jujube fruit, done in the Food Science section of Texas A&M's Horticultural Sciences Department in the 1940s by Dr. Homer Blackhurst, revealed a very high vitamin C content. The versatile jujube can often substitute for apples, pears, plums, or figs in recipes that call for them. From Texas Highways magazine. Try them chilled. Cooking time is sealing time.