A traditional sweet soup of dried longan and lotus seeds, simmered with rock sugar and taken as a year-round tonic.
A staple of Cantonese tong shui (糖水) and old-style household tonics, drawing on traditional Chinese medicine: longan is warming and "nourishes blood," lotus seed calms the heart and tones the spleen. The pairing appears in Qing dynasty (1644–1911) household manuals as a postpartum and convalescence broth. By the 20th century it had moved into everyday Cantonese kitchens as a year-round sweet soup, especially after autumn when the dried fruit comes in.
Gui yuan lian zi tang — a Cantonese tong shui that doubles as Traditional Chinese Medicine: longan warms, lotus seed calms, red dates bridge them. The lotus-seed bitter germ must be poked out or the whole pot turns acrid.
A clear pale-amber broth with floating amber-brown longan flesh and ivory lotus seeds, lightly sweet, served warm in small bowls. The longan tastes faintly of smoke and dried fruit; the lotus seeds are starchy, almost like a soft chestnut. Sweetness comes from rock sugar, not white — a cleaner, less cloying finish. Often eaten at the end of a Cantonese meal or as a between-meal pick-me-up.
Lotus seeds need de-bittering — the green germ inside each seed must be pushed out with a toothpick before simmering, or the soup turns bitter as the bowl cools. Dried longan rehydrates in the simmer and gives up its smoky-sweet juice; fresh longan is wrong here, the dried fruit's concentration is the point. Rock sugar (冰糖) over white because it dissolves slowly and reads as cleaner sweetness against the herbal backbone.
Variations
Classic with red dates and rock sugar; with white fungus (yin er) for a richer mouthfeel; with quail egg added in confinement-soup tradition; Teochew version drops in barley and dried lily bulb (bai he).
On the Palate
Where Dried Longan and Lotus Seed Soup sits in the Chinese flavor cloud
Push the bitter green germ out of every lotus seed before it goes in the pot — leave it and the whole soup turns bitter as it cools, and no amount of rock sugar saves it.
Ingredients
How it's made
4 steps · 37 min active + 30 min waiting
- 12 min
Rinse the lotus seeds and dried longan under cold water. Soak the lotus seeds in warm water for 30 minutes until they soften slightly.
Watch outAfter soaking, check that each seed's bitter germ is gone and the seed gives slightly when pressed — that's your cue it'll cook tender.
- 220 min
Drain the lotus seeds and add them to a pot with fresh water. Bring to a boil over medium-high heat, then reduce to a simmer, cooking until tender, about 20 minutes.
Watch outSimmer gently until the lotus seeds crush easily against the pot side; a rolling boil just breaks them up.
- 310 min
Add the dried longan to the pot and continue to simmer for another 10 minutes, allowing their sweetness to infuse the soup.
- 45 min
Stir in the rock sugar, adjusting to taste, and simmer until fully dissolved and the flavors meld together, about 5 minutes.
Watch outAdd rock sugar only once the seeds are soft, and taste as it melts — sweetness should lift the flavor, not bury it.
