Sweet Mud Soup

Ruth

In my work-in-progress novella, Zen of Tea, Mrs. Chao treats her guests with a famous Cantonese dessert known as “sweet mud soup” (more properly called Black Sesame Soup, 芝麻糊, zhī má hú). This humble yet luxurious treat is a beloved comfort food in southern China, particularly in Guangdong, where it’s enjoyed as a warming dessert or a snack. When one of my critique partners admitted they’d never heard of it, and asked for the recipe, I was delighted to share it.

The name “sweet mud soup” might sound odd, but it perfectly describes the silky, dark, almost volcanic appearance of the dish. Its flavor, however, is unforgettable: nutty, fragrant, sweet, and soothing. If you’ve never made it yourself, it’s surprisingly simple and can be done at home with just a few basic ingredients.

Black Sesame Soup (Cantonese Sweet “Mud” Soup): Serves 4–6

Ingredients:

• 1 cup black sesame seeds
• 2½ cups water
• 4–6 tablespoons sugar (to taste)
• 2 tablespoons cornstarch
• 2 tablespoons water (for slurry)
• Pinch of salt (optional, for depth)

Instructions:

1. Grind the seeds: Put the black sesame seeds into a spice grinder, coffee bean grinder, or high-speed blender. Grind to a fine powder—almost like flour. The finer the grind, the smoother your soup will be.
2. Prepare the base: In a medium saucepan, combine the black sesame powder and 2½ cups of water. Whisk to combine. Place over medium-high heat and bring to a boil. Stir frequently to prevent lumps.
3. Sweeten: Add the sugar (start with 4 tablespoons; you can always add more to taste) and a pinch of salt if desired. Reduce heat and simmer, stirring occasionally, for 5–8 minutes. The mixture should become darker and aromatic.
4. Thicken: In a small bowl, dissolve 2 tablespoons of cornstarch in 2 tablespoons of water to make a slurry. Pour the slurry into the simmering sesame soup, stir and cook for another 2–3 minutes until the soup has thickened to a texture similar to thick cream or gravy.
5. Serve: Ladle the hot soup into small bowls. Traditionally, it’s enjoyed steaming hot and eaten with a spoon. If you wish, garnish with a drizzle of coconut milk.

Notes:

• The sugar can be white, rock sugar, or even brown sugar for a deeper caramel taste.
• Leftovers can be refrigerated and reheated with a splash of water if the soup thickens too much.

This comforting, aromatic soup is perfect for bringing warmth to a rainy evening—just ask Mrs. Chao’s guests in Zen of Tea!