and commonly processed into canned segments Pummelo Pummelos require the warmest growing conditions of the common citrus fruits and have been slow to spread from their home in tropical Asia, where they were cultivated in ancient times They’re large, 10 in/25 cm or more in diameter, with a relatively thick albedo layer; large, easily separated juice vesicles that burst in the mouth; thick and tough segment membranes; and an absence of the bitterness that flavors its offspring the grapefruit Some varieties have pink-red vesicles Orange Nearly three-fourths of all citrus fruit produced in the world are oranges, whose juiciness and moderate size, sweetness, and acidity make them especially versatile They’re probably an ancient hybrid between the mandarin and the pummelo, and have in turn been developed into several very different kinds of fruit Navel oranges probably originated in China, but became a major commodity worldwide when a Brazilian variety arrived in the United States in 1870 The navel-like appearance of their blossom end is caused by the development of a small secondary set of segments Navels are the ideal orange for eating fresh because they’re seedless and easily peeled However, the trees are finicky to grow, and their juice contains fewer fruity esters than the best juice varieties And juice made from navel oranges will become noticeably bitter after about 30 minutes This happens because when the juice cells are broken and their contents mixed, acids and enzymes convert a tasteless precursor molecule into an intensely bitter terpene compound called limonin Citrus Family Relationships ... appearance of their blossom end is caused by the development of a small secondary set of segments Navels are the ideal orange for eating fresh because they’re seedless and easily peeled However, the trees are finicky to grow, and their juice contains fewer fruity... happens because when the juice cells are broken and their contents mixed, acids and enzymes convert a tasteless precursor molecule into an intensely bitter terpene compound called limonin Citrus Family Relationships ...different kinds of fruit Navel oranges probably originated in China, but became a major commodity worldwide when a Brazilian variety arrived in the United States in 1870 The navel-like appearance of their blossom end is caused by