Chinese Dessert Soup: Red Bean Soup Recipe

Chinese dessert soup is a broad family of sweet, spoonable soups served warm or chilled; this version is red bean soup, made with adzuki beans, water, and rock sugar. A long, gentle simmer softens the beans and gives the broth a naturally rich, comforting texture, while dried tangerine peel adds a subtle citrus aroma.

Ingredients

1 cup dried adzuki beans (200 g), picked over and rinsed
8 cups water (1.9 L), plus up to 1 cup (240 ml) hot water as needed
1 small strip dried tangerine peel (about 3 g), rinsed; optional
1/2 cup crushed Chinese rock sugar (about 90 g), or to taste
1/8 teaspoon fine salt (about 0.75 g)
1/2 cup coconut milk (120 ml), optional, for serving

Instructions

Soak the beans. Check the adzuki beans for small stones or damaged beans, then rinse them under cool running water. Put them in a bowl and cover with several inches of water. Soak for 8 hours at room temperature, or overnight. Drain and rinse again before cooking. The soak helps the beans cook more evenly; if your kitchen is very warm, soak them in the refrigerator.
Start the soup. Place the drained beans, 8 cups (1.9 L) fresh water, and the rinsed tangerine peel in a heavy-bottomed pot of about 4-quart capacity. Bring to a boil over medium-high heat. Skim off any foam that gathers on the surface, then lower the heat to maintain a gentle simmer. Keep the lid partly on so steam can escape and the pot does not boil over.
Simmer until the beans are tender. Cook gently for 75 to 90 minutes, stirring every 15 to 20 minutes so beans do not catch on the bottom. Begin checking around 75 minutes: the beans should crush easily between a spoon and the side of the pot, with no firm or chalky center. If the liquid level drops before the beans are tender, add hot water in 1/2-cup (120 ml) increments. Older beans may need the full 90 minutes or a little longer.
Adjust the texture. When the beans are tender, remove and discard the tangerine peel if you want a milder citrus flavor. For a thicker, more substantial soup, mash about 1/2 cup of beans against the side of the pot and stir them back in. For a smoother broth, leave the beans whole and add a splash of hot water if the soup seems too thick. It will thicken further as it cools.
Sweeten and finish. Stir in the rock sugar and salt until the sugar dissolves, about 5 minutes. Taste and add a little more sugar if you prefer a sweeter dessert. Adding sugar after the beans soften helps avoid slowing their tenderizing. Turn off the heat and let the soup stand for 5 minutes before serving. Serve warm, or cool it promptly for chilled servings.

Tips

Use beans that are reasonably fresh. Very old dried beans can remain firm even after a long simmer. If yours are still chalky at 90 minutes, continue simmering and check every 10 minutes rather than adding sugar and assuming they will soften later.
Keep the simmer gentle. A hard boil can break the beans apart before they are evenly tender and can evaporate the cooking liquid quickly. Look for small, steady bubbles, and stir more often near the end when the soup gets thicker.
Choose a practical citrus substitute. Dried tangerine peel, often sold as chenpi in Chinese grocery stores, gives a mellow, slightly bitter citrus fragrance. If you cannot find it, use one thin strip of dried orange peel with most of the white pith removed. Fresh peel is more vivid and less rounded, so remove it after about 30 minutes and taste before adding more.
Sweeten to suit your table. Rock sugar is traditional in many versions and gives a clean sweetness, but regular white sugar works in the same amount. Brown sugar adds a deeper molasses note and darkens the broth. Start with less than the listed amount if you like a lightly sweet soup; you can dissolve in more at the end.

Serving Suggestions

Serve the soup in small bowls as a dessert or a warm afternoon snack. It is pleasant hot, warm, or cold, and the best temperature depends on the weather and your preference. If serving it chilled, refrigerate it until cold and stir before ladling because the beans settle and the liquid thickens as it stands.

A small pour of coconut milk makes the soup creamier and adds a gentle tropical flavor; keep it separate until serving so each person can choose how much to add. For a more classic, simple presentation, serve it plain. A few toasted sesame seeds can add a nutty finish, though they are optional rather than essential. Because this soup is sweet, modest portions work well after a larger meal.

Variations

Chinese sweet soups, often grouped under the name tang shui, vary by region, household, and season; there is no single version that represents them all. This red bean preparation keeps the ingredients straightforward, but you can adapt the texture and flavor without changing the basic method.

Make it silkier: Mash more of the cooked beans or briefly blend a portion, then stir it back into the pot. Avoid blending the entire batch unless you want a smooth purée rather than a soup with distinct beans.
Add dried longan: Stir in 1/4 cup (about 35 g) dried longan during the final 15 minutes of simmering. It contributes a fruity sweetness, so taste before adding all the rock sugar.
Add small tapioca pearls: Cook 1/4 cup (about 40 g) small tapioca pearls separately according to their package directions, then spoon them into individual bowls. Cooking them in the soup can make the broth cloudy and overly thick.
Try a coconut finish: Use coconut milk as a garnish, or replace up to 1 cup (240 ml) of the water with coconut milk after the beans are tender. Adding it earlier can make the pot more likely to scorch, so keep the heat low and stir often.

Storage and Reheating

Cool leftovers in a shallow container and refrigerate them within 2 hours of cooking. Covered, the soup keeps for 3 to 4 days in the refrigerator. It thickens as it chills, so stir in a little water when reheating if you want a looser consistency. Keep coconut milk garnish separate and add it when serving.

Reheat only the portion you plan to eat, either in a saucepan over medium-low heat or in the microwave in a covered, microwave-safe bowl. Stir occasionally so the beans warm evenly, and add water a tablespoon or two at a time if needed. For food safety, reheat leftovers to 165°F (74°C), checking with a food thermometer. Do not leave the soup at room temperature for more than 2 hours. For longer storage, freeze it in airtight, meal-size containers for up to 2 months for best quality; thaw overnight in the refrigerator and stir well after reheating.

Frequently Asked Questions

Can I make Chinese red bean soup without soaking the beans?
Yes, but expect a longer and less predictable simmer. Unsoaked adzuki beans may take around 2 hours or more to become tender, depending on their age. Keep them covered with water, add hot water as needed, and test a bean for a fully soft center before sweetening. Soaking is the more reliable approach for this recipe.

Why are my adzuki beans still hard?
Old beans are the most common reason. Hard water can also slow cooking, and adding sugar before the beans are tender may make the process take longer. Keep simmering gently and check every 10 minutes. If the pot is running low, add hot water rather than letting the beans cook dry.

Can I use red kidney beans instead of adzuki beans?
Adzuki beans are the better choice because they have a smaller size and a flavor suited to this style of sweet soup. Kidney beans have a different texture and taste, so the result will not be quite the same. If substituting, use dried kidney beans and follow their package cooking and food-safety directions rather than assuming the adzuki timing applies.

How can I make the soup less sweet?
Begin with 1/4 cup (about 45 g) rock sugar instead of the full amount, then taste after it dissolves. Add more in small increments if needed. The beans and citrus should still be noticeable; the soup does not need to taste as sweet as a syrup. A pinch of salt helps balance the sweetness without making the dish taste salty.

Should red bean soup be served hot or cold?
Either is suitable. Warm soup highlights the fragrance of the tangerine peel, while chilled soup becomes thicker and especially refreshing in warm weather. If serving cold, let it cool in a shallow container and refrigerate it; do not leave the pot on the counter until it reaches refrigerator temperature.

Can I use a pressure cooker?
Yes, but the cooking time depends on the cooker and whether the beans were soaked. Follow the manufacturer’s directions for cooking dried beans, use enough liquid, and do not fill the cooker beyond its limit for foods that foam. Add the sugar after pressure cooking, once you have confirmed that the beans are tender, then adjust the consistency on the stovetop if needed.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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