Pumpkin Varieties for Thai Cooking: Identification and Species

Thai cooking mainly uses two kinds of pumpkin. The first is the local Thai pumpkin, called fak thong (ฟักทอง, roughly "golden gourd"). It is usually a flattened, ribbed fruit with mottled dark-green skin and deep yellow-orange flesh, and it mostly belongs to the species Cucurbita moschata. The second is the Japanese-type pumpkin, or kabocha, sold in Thailand as fak thong Yipun and belonging to Cucurbita maxima. Butternut squash, another C. moschata, is a common stand-in outside Thailand. Large orange carving pumpkins (Cucurbita pepo) play almost no role in Thai food.

This guide shows you how to recognize each type by color, shape, skin and flesh. It also covers what each one brings to a dish and how well the common substitutes perform.

What is Thai pumpkin (fak thong)?

Thai pumpkin is a winter squash with a hard rind, picked when fully ripe and used as both a vegetable and a dessert ingredient. In a Thai market it is often sold whole, or cut into wedges so shoppers can see the color of the flesh.

Typical features of a local Thai pumpkin:

• Shape: squat and flattened, wider than it is tall, often with shallow vertical ribs and a sunken top around the stem.
• Pumpkin skin: dark green to grey-green, often blotched or speckled with paler green, tan or orange patches. Some local types have a bumpy, warty surface.
• Flesh: deep yellow to orange, firm and close-grained, with a cavity of pale seeds and stringy pulp in the center.
• Aroma: raw flesh smells mildly sweet and green, a little like cucumber mixed with carrot. Cooking brings out a nutty, caramel-like sweetness.

A note on names: fak thong should not be confused with plain fak or fak khiao, which is winter melon. Winter melon has pale, translucent, watery flesh and a mild flavor. It is used in clear soups, not in the sweet, orange-fleshed dishes made with pumpkin.

Thai pumpkin species: which Cucurbita are used?

Every true pumpkin belongs to the genus Cucurbita. Three of its cultivated species matter most for a Thai kitchen. Species is the botanical level. Variety, or cultivar, is the named type within a species, such as butternut or kabocha.

Cucurbita moschata: the backbone of Thai pumpkin

Cucurbita moschata grows well in hot, humid climates, which helps explain why it is so common in Thailand and across Southeast Asia. Fruits in this species usually have a smooth, tan-to-green rind, dense orange flesh and a five-sided, corky, flared stem. Most local Thai pumpkins and butternut squash belong here.

Cucurbita maxima: kabocha and Japanese-type pumpkins

Cucurbita maxima includes kabocha, which Thais call Japanese pumpkin. You can recognize it by its round, soft, spongy stem, which lacks the hard ridges of C. moschata. Kabocha is a popular buy in Thai supermarkets and is a favorite for steaming and for desserts.

Cucurbita pepo: the Halloween pumpkin and zucchini

Cucurbita pepo covers the bright-orange carving pumpkin, zucchini and many ornamental gourds. Its stems are hard, angular and prickly. Carving pumpkins have thin, watery, stringy flesh, so they rarely suit Thai recipes.

Popular pumpkin varieties in Thai cooking

The pumpkin varieties a Thai cook meets most often are the local Thai pumpkin, kabocha and, outside Thailand, butternut squash. Each one looks, feels and cooks differently.

Local Thai pumpkin (fak thong Thai)

This is the classic market pumpkin. It is flattened and ribbed, with mottled green skin and firm golden flesh. When cooked, the flesh is sweet but not sugary. It holds its shape in simmering curries and soups while softening at the edges, and it lightly thickens a sauce. Thai cooks often leave the skin on, because it softens with cooking and helps each chunk stay in one piece.

Warty-skinned local types

Some traditional Thai pumpkins have rough, knobbly skin covered with bumps. These are sometimes called toad-skin pumpkin, fak thong khang khok. The flesh inside is similar to other local types: dense, yellow-orange and sweet. Many cooks value these pumpkins for their firm, slightly dry texture, which suits steaming and custard.

Kabocha (fak thong Yipun)

Kabocha is a round, slightly flattened pumpkin with dark-green, fairly smooth skin. The skin often has faint pale stripes and a dull matte finish. The flesh is a strong yellow-orange. Steamed kabocha has a dry, fluffy, chestnut-like texture and a pronounced sweetness, close to sweet potato. Because it is so dense, it suits steamed custard, desserts and batter-fried slices. It breaks down faster than local Thai pumpkin in long-simmered liquid.

Butternut squash and other imported winter squash

Butternut is long and bell-shaped, with smooth beige skin and bright orange flesh. Most of its seeds sit in the bulb end, and the neck is solid flesh. It is sweeter and wetter than local Thai pumpkin, with a smooth, silky texture when cooked. Outside Thailand it is the easiest pumpkin to find for Thai recipes.

How many pumpkin varieties are there?

There is no single fixed number of pumpkin varieties. Across the cultivated Cucurbita species, growers and seed companies list hundreds of named cultivars, and new hybrids keep appearing. Also, the word pumpkin is used loosely. In some countries it means only round orange fruits. In others, including in Thai usage, it covers many winter squash.

For cooking, the useful question is not how many varieties exist. It is which flesh type you need:

• Dense and dry, like kabocha: best for steaming, custard and frying.
• Firm and moderately moist, like local Thai pumpkin: best for curries, soups and stir-fries.
• Soft and wet, like butternut: good for purées, soups and quick curries, but less sturdy.
• Watery and stringy, like carving pumpkins: poor for most Thai dishes.

Comparing different types of pumpkins for Thai dishes

The table below compares the different types of pumpkins you are most likely to find, plus winter melon, which is often mistaken for pumpkin because of its Thai name.

How to recognize Thai pumpkin and avoid look-alikes

The quickest way to identify a pumpkin is to check four things: the stem, the skin, the cut flesh and the weight.

1. Look at the stem. A hard, five-angled stem that flares where it meets the fruit points to C. moschata, such as local Thai pumpkin or butternut. A round, corky, spongy stem points to C. maxima, such as kabocha. A prickly, sharply angled stem points to C. pepo.
2. Check the skin. A dull, hard rind that your fingernail cannot easily dent means the fruit is mature. A glossy, soft skin suggests it was picked young, and its flesh will be watery and less sweet.
3. Examine cut wedges. Good flesh is deep yellow to orange, tight and moist, not dry or fibrous. The seeds should look plump. Pale or greenish flesh means the pumpkin was not fully ripe.
4. Feel the weight. A pumpkin that feels heavy for its size usually has thick, dense flesh. A light one may be hollow or drying out.
5. Rule out winter melon and sweet potato. Winter melon has white, almost glassy flesh. Orange-fleshed sweet potato is a root with thin, papery skin and no seed cavity.

What pumpkin contributes to Thai dishes

In Thai food, pumpkin adds natural sweetness, a warm orange color and a soft, velvety body that balances spicy, salty and sour flavors. Its sweetness tames chili heat, and its starch gently thickens coconut-based sauces.

• Red curry with pumpkin (gaeng phed fak thong): chunks of pumpkin simmer in coconut milk with red curry paste, often with chicken or pork and Thai basil. The pumpkin softens at the edges and turns the sauce slightly creamy.
• Peppery vegetable soup (gaeng liang): a rustic, non-coconut soup flavored with white pepper, shallots, shrimp paste and dried shrimp. Pumpkin cubes add sweetness against the peppery broth.
• Stir-fried pumpkin with egg (fak thong pad khai): thin slices are stir-fried with garlic, then tossed with egg and seasoned with oyster sauce or fish sauce. It is a simple home dish that is good for beginners.
• Pumpkin custard (sangkhaya fak thong): a small whole pumpkin, usually kabocha or a dense local type, is hollowed out, filled with coconut milk, egg and palm sugar custard, then steamed and sliced into striking wedges of orange and cream.
• Pumpkin in sweet coconut milk (fak thong kaeng buat): soft pieces of pumpkin are simmered in salted, sweetened coconut milk and served warm as a dessert.

Thai cooks also eat the tender shoots and leaves of the pumpkin vine, either stir-fried or blanched and served with chili dip. They are a separate vegetable from the fruit, but they come from the same plant.

How to prepare Thai pumpkin at home

To prepare Thai pumpkin or kabocha, you only need a heavy knife or cleaver, a sturdy spoon and a cutting board that will not slip.

1. Wash and dry the whole pumpkin, especially if you plan to cook it with the skin on.
2. Stabilize it. Slice a thin piece off one side so the pumpkin sits flat, or set it stem-up on a damp cloth.
3. Halve it carefully with a heavy knife or cleaver, pressing down on the back of the blade rather than sawing.
4. Scoop out the seeds and stringy pulp with a metal spoon.
5. Decide on the skin. Leave it on for curries, soups and stir-fries, where it helps pieces hold their shape. Peel it with a sharp knife for smooth purées or delicate desserts.
6. Cut evenly sized pieces. Use bite-sized chunks for curry and soup, thin slices for stir-fry and wedges for steaming.
7. Add pumpkin at the right moment. Put it into simmering curry or soup early enough to become tender but stop before it collapses. Test with a fork or the tip of a knife.

A steamer, whether a stacked metal pot or a bamboo basket set over a wok, is the traditional tool for pumpkin custard and for plain steamed pumpkin.

Substitutes for Thai pumpkin and their limitations

If you cannot find local Thai pumpkin, kabocha is the closest substitute, followed by butternut squash. Each swap changes the dish somewhat:

• Kabocha: excellent flavor and color, and the best choice for pumpkin custard. In long-simmered curry it softens and crumbles more, so add it later or cut larger pieces.
• Butternut squash: easy to find and pleasantly sweet. Its wetter, softer flesh breaks down quickly and can make a curry sweeter and thinner. Cut it into larger chunks and cook it for less time.
• Other dense winter squash such as red kuri or acorn squash: usable in curries and soups. Flavor and sweetness vary, so taste and adjust the seasoning.
• Sweet potato: a last resort for curries. It gives similar color and sweetness, but its texture is starchier and its flavor is earthier rather than pumpkin-like.
• Carving pumpkin: not recommended. Its watery, stringy flesh adds little flavor and turns mushy.

Whatever type you use, choose a pumpkin with dense, deep-orange flesh. That trait matters more than the variety name for getting the sweet, golden character that makes pumpkin so appealing in Thai cooking.