This soup is based on a common Chinese dessert soup, taro sago, which features delightful little tapioca pearls suspended in a creamy blend of coconut milk and taro (and sometimes sweet potato). My version omits the taro but includes two kinds of sweet potatoes—orange and vibrant purple—for a taste and color contrast. Similar to tapioca pudding, this comforting dish can be served warm or cold and makes for a restorative snack in the middle of the day or not-too-sweet dessert at the end of a big meal.
Bring 8 cups water to a boil in a medium saucepan. Add the tapioca and reduce to a simmer. Simmer, stirring occasionally, until the tapioca pearls are just tender and mostly translucent with a small white dot in the middle, 12 to 15 minutes.
Remove from the heat and cover with a lid until most of the pearls are fully translucent, 5 to 10 minutes. Drain through a fine-mesh sieve and rinse under cold water. Store in a bowl of ice water until ready to use. If not using within 2 hours, drain the pearls and store in the refrigerator.
Meanwhile, cover the orange sweet potatoes with an inch of water in a large saucepan and bring to a boil. Reduce to a gentle simmer and cook until tender but not falling apart, about 5 minutes. Drain and set aside. Reserve the saucepan.
Combine the purple sweet potatoes, sugar and 4 cups water in the reserved saucepan. Bring to a boil and reduce to a simmer. Cook until fully tender, 5 to 7 minutes, then remove from the heat. Transfer the purple sweet potatoes to a blender with a slotted spoon. Add the coconut milk and about 1 cup of the cooking liquid and puree until smooth. Return to the saucepan with the remaining cooking liquid and stir. The consistency should be like a lightly thickened cream soup. Stir in the vanilla and salt.
If serving cold, refrigerate the sweet potato soup until thoroughly chilled, at least 2 hours. If serving warm, place the saucepan over medium heat until hot but not boiling.
To serve, divide the drained tapioca pearls and soup among 8 bowls. Stir to loosen and separate the pearls. Top with the orange sweet potato chunks.
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