Faan Syu Tong Sui
番薯糖水·(faan1 syu4 tong4 seoi2)
Tong Sui for the Soul: The Rhythms of Dessert
There’s nothing fancy about faan syu tong sui. It’s a humble, working-class dessert born of necessity, but it hits the soul like a warm blanket on a bitter Tuesday night. The magic lies entirely in the aggressive, unapologetic bite of old ginger cutting through the molasses-like depth of Chinese rock sugar, softening those sweet potatoes until they surrender completely. It’s what your grandma made when you were sick, or sad, or just home. Pure, unadulterated comfort.
Ingredients
- water6 cup
- old ginger3 oz
- yellow-fleshed sweet potatoes1 1/2 lb
- Chinese brown rock sugar3 oz
Method
- 01
Bring the water and ginger to a rolling boil.
Smashing the ginger releases its aggressive, spicy oils. Let it boil hard in the water for at least 10 minutes to build a fierce broth.
- 02
Submerge the sweet potatoes.
Drop the chunks into the ginger broth and lower the heat to a steady simmer. You want them tender enough to yield to a spoon, but not so soft they turn the soup to mush—this takes about 15 minutes.
- 03
Melt down the rock sugar.
Stir in the brown rock sugar during the last 5 minutes of cooking. Taste the broth. It should be unapologetically gingery and deeply sweet, so adjust with more sugar if your soul demands it.
- 04
Serve piping hot.
Ladle the hot soup into small bowls. It’s best eaten immediately, warming the bones from the inside out.
Notes
Seek out brown rock sugar.
Sold in rigid rectangular blocks at Asian markets as peen tong, it offers a subtle caramel depth that regular white sugar simply cannot fake.
The choice of potato matters.
Asian varieties with yellow or purple flesh hold their shape better than standard American yams, remaining slightly firm rather than disintegrating into the broth.