Green-Core Black Bean, Goji Berry and Red Date Soup (Qing Ren Hei Dou Soup)

Why people make this soup

In traditional Chinese food therapy, black is the colour associated with the kidneys, and black beans have been eaten for centuries as a nourishing food for kidney health. But not all black beans are used the same way — the variety that keeps coming up in classical food-therapy texts is the “green-core” black bean (qing ren hei dou), which has green flesh inside its black skin rather than the yellow flesh of common black beans. Bro Niu has checked multiple food-therapy references and they consistently specify this green-core variety for therapeutic use, so when shopping, look for the one with green insides.

When kidney vitality is well supported, traditional thinking says a number of things follow: stronger hair, clearer vision, a brighter complexion, and better energy overall. This soup is a straightforward way to incorporate that idea into everyday cooking — three simple ingredients, naturally sweet, no meat required.

Who it suits / who should be cautious

• Well suited for adults who feel they are ageing faster than they should, experience occasional poor memory or difficulty concentrating, have thinning or greying hair, feel easily cold, notice reduced vitality, or experience frequent urination.
• Those with a hot constitution or children should not eat roasted (stir-fried) black beans in large amounts, as roasting makes them warming and may cause internal heat to flare. For elderly people with frequent nighttime urination, tinnitus, or children with bedwetting issues, the roasted version is actually preferred.
• The black bean skin should be kept on — it contains compounds traditionally used to nourish blood and calm wind, and is particularly beneficial for those with skin conditions or those who sweat easily.

Why these ingredients (the food-therapy logic)

• Green-core black bean (qing ren hei dou): The star of this soup. Traditionally associated with kidney nourishment, hair health, vision support, and skin brightening, partly due to its rich content of vitamin E, B vitamins, and anthocyanins (in the skin). The green flesh indicates higher bioflavonoid content compared to the yellow-fleshed variety.
• Goji berries (gou qi zi): Among the most widely used herbs in Chinese food therapy. Traditionally valued for nourishing liver and kidney yin, brightening the eyes, and supporting blood. When buying, look for berries with a yellowish-white stem mark at the top — this indicates they have not been dyed.
• Red dates (hong zao): Warm and sweet, they tonify qi and nourish blood, and their sweetness makes the soup naturally palatable without added sugar. Xinjiang dates with the stone still inside (which rattle when shaken) are considered highest quality.

Ingredients (2–3 servings)

Ingredient	Amount	Notes
Green-core black beans	~75 g	Rinse and soak 30 min before cooking
Goji berries	~15 g	Rinse gently
Red dates	8 pieces	Pit removed, rinse
Water	6 bowls (~1.2 L)

Method

1. Soak and rinse the black beans. Rinse the goji berries gently. Pit and rinse the red dates.
2. Place the black beans and red dates into a pot with 6 bowls of water. Bring to a boil, then reduce to a medium-low simmer and cook for about 1 hour.
3. Add the goji berries and continue to simmer for a further 10 minutes.
4. Serve warm, eating both the soup and all the ingredients.

Bro Niu’s tips

Keep the bean skins on — they hold some of the most valuable compounds. When buying goji berries, choose ones that still have the small yellow-white stem scar at the tip, as this indicates they have not been artificially coloured. For red dates, Xinjiang jujubes with stones (stone rattles inside when shaken) are the most nourishing. Roasted black beans are more warming in nature — good for elderly people with frequent nighttime urination or tinnitus — but those who run hot or children should stick to the unroasted version in this recipe.

Community questions answered (selected)

• Q (Li Li): If I am worried about red dates being too drying (causing internal heat), what can I substitute? Bro Niu: You can replace the red dates with southern dates (nan zao) or dried figs — both are gentler and less likely to cause dryness.

• Q (Chan): I have polycystic ovary syndrome (PCOS). Is black bean soup suitable? I know soy has phytoestrogens that can affect hormones — does black bean have the same concern? Bro Niu: You can drink this black bean soup and black bean milk. Black beans contain more vitamin B, E, and minerals than yellow soybeans, and can be supportive for the eggs. Most importantly, maintain a balanced diet with plenty of fresh vegetables and fruit. For PCOS, avoid poultry raised with hormones and farmed fish raised artificially. You can also brew a tea with poria mushroom (fu ling) and lily bulb powder together with some goji berries — this combination is very beneficial for those with cystic conditions.

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Published June 9, 2015 · Adapted and translated for Nourilo from a traditional home-kitchen recipe. Approx. 4 min read.