Green Botanica · Plant Guide
Aegle marmelos
มะตูม · bilva · bel · maja
Bael is a thorny tree of the citrus family from the Indian subcontinent. Its hard-shelled fruit hides a fragrant orange pulp that tastes like marmalade, with hints of tamarind and caramel. In India the tree is sacred to Shiva; in Thailand the dried fruit is simmered into a copper-coloured drink, nam matoom.
Meet the plant
Bael is a slow-growing tree of the citrus family, Rutaceae, 10–15 m tall, with straight, sharp spines. It sheds its leaves in the dry season. Each leaf has three leaflets, sometimes five, dotted with tiny oil glands that show as clear points against the light. In spring, with the new leaves, it opens fragrant, greenish-white flowers.
The fruit is round to pear-shaped, 5–20 cm across, with a hard, woody shell that turns from grey-green to yellow. It takes 10 to 11 months to ripen, and a ripe fruit often has to be cracked open with a hammer. Inside is a soft, orange, fragrant pulp with 10–15 flat seeds, each in a sac of sticky, clear mucilage.
Bael grows in dry forests and on poor soils, and it fruits well only where there is a marked dry season. The fruit ripens when the tree is bare, so in the dry months its leafless branches hang full of fruit.
| Bael | Wood apple | |
|---|---|---|
| Leaves | Three leaflets | Several small leaflets along a stalk |
| Shell | Smooth, grey-green turning yellow | Whitish, rough and scurfy |
| Pulp | Orange, fragrant and sweet | Brown, mealy and tart |
The story
For some three thousand years, bael has been a sacred tree, a food and a household remedy in India. From there it spread to Southeast Asia, where it has been grown for centuries.
Vedic texts, including the Atharvaveda, name the bilva as an auspicious tree.
Classical Ayurvedic texts describe the unripe and the ripe fruit separately, each with its own uses. The root is one of the “ten roots”, dashamula.
The Brihat Samhita, a Sanskrit encyclopaedia, says that a bael tree can show where water lies underground.
A Javanese chronicle tells how men clearing a forest tasted a bitter maja fruit, and the new kingdom was named Majapahit, “bitter maja”. It is a legend, but the name stayed.
Linnaeus named the tree Crateva marmelos; in 1800 the Portuguese botanist José Corrêa da Serra gave it a genus of its own, Aegle. Marmelos comes from the Portuguese marmelo, quince.
At the coronation of King Vajiralongkorn in Bangkok, the chief Brahmin priest offered bael leaves for the King to wear behind his ear, an old sign of blessing.
In India, the three-part leaf stands for the Hindu trinity, the Trimurti, and bael leaves are offered to Shiva. Ripe pulp becomes bael sharbat, a classic summer drink, and in Odisha bela pana for the New Year. In Sri Lanka, dried bael flowers make a popular tea, beli mal.
In Thailand, dried slices are simmered into nam matoom (น้ำมะตูม), served hot or iced, and the fruit is candied in syrup as matoom chuem. Bael leaves are worn behind the ear at ceremonies, and bael is the provincial tree of Chai Nat.
From fruit to powder
Bael is harvested in the dry season, in India mostly in April and May. What happens next depends on the tradition: in Thailand young fruit is sliced and sun-dried for drinks, while for pulp and powder the fruit is usually left to ripen.
Fruit ripens 10–11 months after flowering. For drying slices it is picked younger and firmer; for pulp it is picked ripe.
The woody shell is cracked open, the pulp is scooped out, and the seeds and sticky mucilage are removed.
The pulp is spread thinly and dried in the sun, in the shade or in warm air. In trials, a 2 mm layer at about 50 °C dried best; above about 65 °C more nutrients were lost. Too much heat browns the pulp and dulls its aroma.
Young fruit is cut into rounds with the shell on and dried in the sun. The slices are toasted before brewing (page 6).
Inside the fruit
Ripe bael pulp is roughly 60% water and 30% carbohydrate. As the fruit ripens, its sugar content more than doubles, while acidity and fibre fall. That is why young and ripe bael taste so different.
Ripe pulp is rich in sugars and in mucilage, a soluble fibre that makes it thick and pasty. In water it gives bael drinks their body.
Bael’s signature compound is marmelosin, the same molecule as imperatorin. The fruit also contains psoralen and marmesin; amounts vary between varieties.
A Thai study found 28 volatile compounds in ripe pulp, most of them terpenes. Carotenoids give the pulp its orange colour.
| Young fruit | Ripe fruit | |
|---|---|---|
| Pulp | Firm and pale cream | Soft, orange and fragrant |
| Taste | Astringent, less sweet | Sweet, resinous, marmalade-like |
| In the kitchen | Sliced and dried for drinks in Thailand | Eaten fresh, in sharbat and lassi, dried as powder |
| In Ayurveda | Unripe fruit described on its own | Ripe fruit treated mainly as food |
Tea & kitchen
A traditional Thai drink from dried bael slices; makes 1.5–2 litres
Toast the slices in a dry pan or over a low flame until fragrant and a shade darker, but never burnt. Bring the water to the boil, add the slices and simmer gently for 15–20 minutes. Stir in the sugar and salt until dissolved, taste, then strain. Drink warm, or cool it and pour over ice.
— other ways to enjoy bael
The Indian way: mash ripe pulp in cold water, sieve it, sweeten with jaggery and chill. Some add roasted cumin and black salt.
A home idea: blend 1–2 tsp powder with 200 ml plain yoghurt, a splash of cold water or milk and a little honey.
Our own favourite: a small pinch of bael powder stirred into a cup of coffee adds a soft, fruity, caramel-like note.
Beyond flavour
Human studies on bael fruit are few. Three of them, with what they did and did not show:
IMC J Med Sci · 2013
Crossover trial · 30 peopleIn Bangladesh, 30 adults with type 2 diabetes took 7 g a day of sun-dried unripe bael pulp powder in water for 21 days, and no bael for another 21 days, in random order. Fasting blood sugar did not change.
J Curr Adv Med Res · 2021
Same trial · hs-CRPA second report from the same trial looked at hs-CRP, a blood marker of low-grade inflammation. It did not change with bael powder.
Indian J Med Res · 1989
RCT · 169 peopleIn India, 169 people with irritable bowel syndrome took an Ayurvedic mix of bael and brahmi (Bacopa), standard medicines or a placebo for 6 weeks. Symptoms improved in 65%, 78% and 33% of them; no treatment prevented relapse.
Educational product information. Not medical advice. If you are pregnant, breastfeeding or taking medication, consult your doctor before using a new botanical product.
