Mango Soup with Tapioca Pearls and Pomelo

Here is perhaps the ultimate sweet fruit soup, a modern classic born in Hong Kong, the most recent in the long heritage of such sweets. I have told the story of sweet soups in China, of how they have been based on virtually every fruit grown in the country, from northern apples to southern litchis, and sweetened with sugarcane sugar, rock sugar crystals, brown sugar, or beet sugar. And I have explained how China welcomed fruits from elsewhere in Asia, the Middle East, and the Americas: fing