Rock sugar lotus seed soup — bing tang xiang lian (冰糖湘莲) — is one of Hunan's most famous traditional desserts. Sweet, delicate, and subtly fragrant, it is made with just a few simple ingredients: plump lotus seeds, rock candy, red dates, and wolfberries simmered slowly in clear water. The result is a light, not-too-sweet soup with tender, creamy lotus seeds floating in a pale amber broth. It is often served at banquets, weddings, and festivals, and is considered nourishing and cooling in traditional Chinese medicine. After a spicy Hunan meal, a bowl of sweet lotus seed soup is the perfect finish.
Bing tang xiang lian (冰糖湘莲) is a classic Xiangjiang River school dessert — and one of the few Hunan dishes that is not spicy. The name literally means "rock sugar Xiang lotus," a reference to the famous lotus seeds of Hunan's Xiangtan region. Hunan has been known for its lotus seeds for over a thousand years. The Xiangtan variety (xiang lian, 湘莲) is prized for being plumper, rounder, sweeter, and more fragrant than lotus seeds from other regions. In traditional Chinese culture, lotus seeds symbolize purity, fertility, and prosperity — they are often served at weddings and during the Lunar New Year for good fortune. This dessert exemplifies the Chinese philosophy of yao shi tong yuan (药食同源, "medicine and food share the same origin") — it is both delicious and nourishing, believed to calm the mind, strengthen the spleen, and clear heat from the body.
Ingredients
The ingredient list is short and simple. The quality of the lotus seeds and rock sugar is what makes the difference between a good soup and a great one.
- Dried white lotus seeds — 100 g. Look for peeled, white lotus seeds (the brown-skinned ones have a tougher outer layer). Hunan Xiang lotus seeds are considered the best.
- Rock candy (bing tang) — 60 g, or to taste. Rock sugar is less sweet than granulated sugar and has a cleaner, more rounded sweetness. It is the traditional sweetener for this dessert.
- Dried red dates (hong zao) — 6, pitted. They add natural sweetness, color, and a subtle date flavor. Remove the pits before using.
- Dried wolfberries (goji berries) — 1 tablespoon. Added at the end for color, texture, and nutrition.
- Dried lily bulbs — optional. They add another texture and are also considered nourishing in Chinese medicine.
- Water — pure, clean water. The broth is clear, so the quality of the water matters.
Step-by-Step Instructions
- Soak the lotus seeds. Place the dried lotus seeds in a medium bowl and cover them with plenty of cold water — they will expand significantly, so use at least 3 times their volume of water. Let them soak for at least 4 hours at room temperature, or preferably overnight in the refrigerator. During soaking, the seeds will plump up and soften, roughly doubling in size. Soaking is not optional — it ensures that the seeds cook evenly and have a tender, creamy texture throughout. If you skip soaking, the outside may turn mushy before the center is cooked through. If you are really pressed for time, you can soak them in hot water for 1 to 2 hours, but the texture will not be quite as good. If using dried lily bulbs, soak them in a separate small bowl for 30 minutes.
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Check for and remove the green germ. After soaking, drain the lotus seeds in a fine sieve. Examine each seed carefully for a small green germ (embryo) in the center — it looks like a tiny green sprout tucked inside a small channel. If present, remove it with the tip of a toothpick, the point of a small knife, or by squeezing the seed gently from one end. This green germ is extremely bitter, and even one left in the soup can make the whole pot taste bitter. Most modern packages of peeled white lotus seeds have already had the germs removed, but it only takes a minute to double-check, and it is well worth the effort. While you are at it, discard any seeds that look discolored, shriveled, or damaged.
Why soaking matters
Dried lotus seeds are very hard and dense. Without soaking, they require a long cooking time to become tender, and the texture is often uneven — mushy on the outside, still firm in the center. Soaking rehydrates the seeds gradually and evenly, so they cook uniformly and have a perfect creamy-tender texture. Think of it like cooking dried beans — you would not throw unsoaked beans into a pot and expect them to turn out well. The same principle applies here.
- Simmer with rock sugar and red dates. Drain the lotus seeds and transfer them to a clay pot (best for even heating and traditional flavor) or a small saucepan. Add 1 liter of cold water. If using lily bulbs, add them now. Add the pitted red dates. Place over medium-high heat and bring to a gentle boil. As soon as it starts boiling, reduce the heat to the lowest setting — you want a very gentle simmer, with just a few small bubbles rising to the surface. A rolling boil will make the soup cloudy and can cause the lotus seeds to break apart. Cover with the lid slightly ajar to let some steam escape. Simmer for 30 to 40 minutes. The lotus seeds are done when they are tender but still hold their shape — bite into one to test; it should be creamy and soft all the way through, with no hard center. Add the rock sugar about 10 minutes before the end of cooking time, stirring gently to help it dissolve.
- Add wolfberries in the last 5 minutes. While the soup simmers, rinse the wolfberries (goji berries) under cold running water in a small sieve. About 5 minutes before the soup is done, add the wolfberries. They rehydrate very quickly in the hot liquid — just a few minutes is enough for them to plump up and turn bright red. If you add them too early, they will overcook, become mushy, and lose their vibrant color and slightly chewy texture. Adding them at the end keeps them bright, plump, and visually appealing. Give the soup a gentle stir after adding them. Taste the soup and adjust the sweetness — if it is not sweet enough, add a bit more rock sugar and stir until it dissolves. Remember that the soup will taste slightly sweeter when served cold.
- Serve warm or chilled. Turn off the heat. Lotus seed soup can be served either warm or cold — both are traditional. In the winter, it is served hot as a warming, nourishing dessert. In the summer, it is chilled and served cold as a refreshing, cooling treat. To serve cold, let the soup cool to room temperature, then cover and chill it in the refrigerator for at least 2 hours before serving. Ladle into small bowls, making sure each bowl gets several lotus seeds, a red date, and a scattering of wolfberries floating in the clear amber broth. For an elegant presentation, serve in small ceramic bowls or glass dessert bowls. It is light, not too sweet, and the perfect way to end a heavy or spicy meal.
Hunan's Xiangtan County (湘潭县) is known as the "hometown of Chinese lotus seeds" (中国湘莲之乡), and its xiang lian (湘莲, "Xiang lotus") seeds have been prized for over a thousand years. Here is what makes them special:
- Superior quality. Xiang lotus seeds are plump, round, and creamy white with a naturally sweet, nutty flavor. They are said to have a higher starch content and lower moisture than lotus seeds from other regions, giving them a better texture when cooked.
- Three red lotus. The most famous variety is called "three red lotus" (三红莲) — named for the red color of the seed shell, the red flower, and the red seed coat. When peeled, the white seed inside is large and round.
- Historical tribute. During the Ming and Qing dynasties, Xiangtan lotus seeds were considered a gong pin (贡品, "tribute item") — they were sent to the imperial court as a special delicacy for the emperor and his court. That tradition of quality continues today.
- Cultural significance. In Chinese culture, the lotus symbolizes purity and enlightenment (it grows from muddy water but emerges clean and beautiful). Lotus seeds specifically symbolize fertility and prosperity — the word for "lotus" (莲, lián) sounds similar to the word for "continuous" (连, lián), and the many seeds in a lotus pod represent many children and abundant blessings.
- Modern production. Today, Hunan produces thousands of tons of lotus seeds every year, with Xiangtan and nearby counties being the major production areas. The seeds are exported across China and around the world.
Substitutions & Adjustments
This is a simple dessert, but there are many ways to adapt it to your taste and what you have available.
Sweeter or less sweet
Traditional lotus seed soup is lightly sweet — it is not a cloyingly sweet Western dessert. The sweetness should be delicate and balanced. Start with 50 g of rock sugar and add more to taste. Keep in mind that the soup will taste sweeter when cold, so if you are serving it chilled, err on the side of slightly less sweet when it is hot. If you prefer it sweeter, you can add up to 100 g of rock sugar.
Ingredient substitutes
- No rock sugar: Use granulated white sugar or brown sugar. Brown sugar will give the soup a darker color and a deeper, more molasses-like flavor. Use slightly less sugar than the rock sugar amount, as granulated sugar is sweeter by weight.
- No lotus seeds: You can make a similar dessert with other dried beans or seeds — red bean soup is the most common alternative, but mung bean soup, white fungus soup, or snow fungus soup follow the same principle of sweet, simple Chinese dessert soups.
- No red dates: Use raisins or dried cranberries for a similar sweet, chewy element. The flavor will be different, but the concept works.
- Add more ingredients: This soup is endlessly customizable. Add pear slices, apple chunks, sweet potato, sago pearls, tapioca, or coconut milk for different textures and flavors. Cantonese versions often include snow fungus and papaya.
Make ahead
This dessert is perfect for making ahead — it actually tastes better after a day in the fridge, as the flavors meld and the lotus seeds absorb more of the sweet broth. Make it the night before, let it cool, then chill. It will keep for several days.
Storage
Leftover lotus seed soup keeps in the refrigerator for up to 5 days in an airtight container. The lotus seeds will continue to soften and absorb liquid over time, so the texture will change slightly — they become more creamy and melt-in-your-mouth. You can also freeze it for up to 3 months. The texture of the lotus seeds may become slightly softer after freezing, but the flavor remains good.
Nutrition
Estimated values per bowl (recipe serves 4). This is a relatively light dessert — most of the calories come from the natural sugars in the rock sugar and the carbohydrates in the lotus seeds. Lotus seeds are a good source of protein, fiber, and minerals like magnesium and potassium.
| Nutrient | Per serving |
|---|---|
| Calories | 180 kcal |
| Protein | 5 g |
| Total fat | 1 g |
| Saturated fat | 0 g |
| Carbohydrates | 40 g |
| Sodium | 15 mg |
| Sugar | 28 g |
Values are estimates based on standard ingredient databases. Actual nutrition will vary depending on the amount of rock sugar you use and the specific variety of lotus seeds.
Frequently Asked Questions
Related Recipes
If you enjoy this delicate Hunan dessert, explore these other classic dishes that showcase the sweeter and milder side of Hunan cuisine.