Cambodian Pumpkin Coconut Custard

A whole steamed pumpkin filled with smooth coconut custard, photographed from above on a serving plate. — Sankhya Lapov, a traditional Khmer dessert, is steamed whole and served in wedges.

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A whole pumpkin, hollowed out and filled with a silky coconut custard, then steamed until the flesh turns tender enough to spoon out with the custard. This is Sankhya Lapov (សង់ខ្យាល្ពៅ), a traditional Khmer dessert that turns a simple squash into a natural serving bowl. In Khmer, sankhya means custard and lapov means pumpkin. The custard is barely sweet, rich with egg yolks and coconut milk, with a small amount of salt to keep the palm sugar from becoming cloying. It is a dessert built for sharing, and it is far easier to make at home than its polished appearance suggests. All you need is a steamer, a little patience, and a pumpkin that sits flat in the pot.

What You Need

The ingredient list for this dessert is short, and the quantities in the recipe card below are the ones to follow. A medium pumpkin works best here because it fits inside a standard steamer and holds enough custard for four to six servings. Egg yolks, not whole eggs, give the custard its dense, smooth set. Palm sugar brings a rounded, almost caramel-like sweetness that white sugar cannot replicate in the same way. Full-fat coconut milk is important for richness, and the small amount of salt is not a mistake—it sharpens the custard and balances the sugar.

Equipment

Steamer pot with a lid: To hold the pumpkin above simmering water and steam it gently until the custard sets and the pumpkin flesh softens.
Chef’s knife: To carve the top off the pumpkin and to check the doneness of the flesh near the end of cooking.
Cutting board: To hold the pumpkin steady while you cut around the stem and lift out the top.
Large spoon or scoop: To scrape out the seeds and fibers from the inside of the pumpkin without piercing the flesh.
Mixing bowl: To whisk the egg yolks, coconut milk, palm sugar, and salt together before pouring them into the pumpkin.
Whisk: To combine the custard ingredients smoothly, without creating air bubbles that would leave holes in the finished custard.
Measuring cup: To measure the coconut milk accurately.
Measuring spoons: To measure the salt and to portion the palm sugar if it is not already measured.
Heatproof spatula or spoon: To help guide the custard into the pumpkin cavity and to stir the mixture gently.
Serving plate or shallow bowl: To present the steamed pumpkin at the table and to catch any custard that spills when it is cut.

How to Make Cambodian Pumpkin Coconut Custard

Step 1: Prepare the pumpkin

Place the pumpkin on a cutting board and use a chef’s knife to carve a lid from the top, angling the blade inward so the lid can sit back into place later. Lift off the top and set it aside. Use a large spoon to scrape out the seeds and stringy fibers from the center. Work carefully so you do not cut through the bottom or sides of the pumpkin. Rinse the inside and the lid under cold water, then leave the pumpkin upside down on a clean towel to drain and dry while you make the custard.

Step 2: Mix the custard

In a mixing bowl, combine the egg yolks, coconut milk, palm sugar, and salt. Use a whisk to stir gently until the sugar has mostly dissolved and the mixture is smooth. Keep the whisk moving slowly and low in the bowl; you do not want to whip air into the custard. Small bubbles will rise to the surface during steaming and create a pitted texture. If foam forms on top, skim it off with a spoon before pouring.

Step 3: Fill and cover the pumpkin

Set the dried pumpkin upright in a steamer pot or on a heatproof plate that will fit inside your steamer. Pour the custard mixture into the cavity, leaving about 1 centimeter of space below the rim, because the custard will rise slightly as it cooks. Replace the carved pumpkin lid on top. If the lid does not sit snugly, it is fine for it to rest slightly ajar; the steam will still set the custard.

Step 4: Steam until the custard is set

Add water to the bottom of the steamer pot, making sure the water does not touch the bottom of the pumpkin. Bring the water to a simmer over low to medium heat, then cover the pot with a lid. Steam for about 1 hour, checking the water level occasionally and adding hot water if it runs low. Near the end of the cooking time, insert a chef’s knife through the side of the pumpkin into the custard. The knife should come out clean or with only a little thick custard clinging to it, and the pumpkin flesh should feel soft when pressed. If the custard is still liquid in the center, continue steaming in 10-minute increments.

Step 5: Cool completely before serving

Carefully lift the pumpkin out of the steamer using tongs or a wide spatula and set it on a serving plate. Leave it undisturbed at room temperature for at least 45 minutes. This cooling period is part of the recipe: the custard continues to set as it cools, and the pumpkin firms up enough to slice without collapsing. Once cooled, the custard should be smooth and sliceable, with the texture of a firm flan.

Cooking Tips

Keep the custard still while it steams. A gentle, steady simmer is better than a rolling boil. If the water bubbles too aggressively, the custard can curdle or develop a spongy texture.
Do not skip the salt. One teaspoon may seem like a lot for a dessert, but it rounds out the palm sugar and makes the coconut flavor taste more like itself.
Check the water level. Steam evaporates over an hour of cooking. Keep a kettle of hot water nearby so you can top up the pot without lowering the temperature.
Let it cool before cutting. The custard needs the full cooling time to set. If you cut into the pumpkin while it is hot, the custard will still be soft in the middle.

How to Serve

Sankhya Lapov can be served slightly warm or fully chilled. To serve, cut the pumpkin into wedges with a chef’s knife, slicing straight down through the flesh and custard so each portion gets a piece of pumpkin and a wedge of custard. The skin is not usually eaten, but the softened flesh is scooped out with a spoon along with the custard. For a contrast in texture, serve it with a small bowl of extra coconut milk drizzled over the top, or alongside a scoop of sweet sticky rice. If you enjoy coconut-based Khmer desserts, you might also like our Cambodian coconut sponge cake, which uses coconut in a very different but equally satisfying way. For more sweet ideas, browse the full collection of Cambodian desserts and drinks on CambodiaRecipe.

Recipe Notes

Oven alternative: If you prefer not to steam, the pumpkin can be baked. Place the filled pumpkin in a baking dish and bake at 180°C (350°F) for about 40 minutes, or until the custard is set and the pumpkin flesh is tender. The texture will be slightly firmer and the pumpkin edges may caramelize.
Pumpkin choice: A kabocha squash is the traditional choice and gives a naturally sweet, bright orange flesh. A small sugar pumpkin or a butternut squash can also work, but adjust the steaming time based on the size and thickness of the flesh.
Make-ahead: The custard can be steamed a day in advance. Cool it completely, then refrigerate it whole. Bring it to room temperature or serve it cold, depending on your preference.

Frequently Asked Questions

Can I use whole eggs instead of egg yolks?

The supplied recipe uses 6 egg yolks for a dense, rich custard. Whole eggs contain more water in the whites and will give you a softer, less creamy set. If you use whole eggs, the custard will still cook, but the texture will be closer to a light flan than the traditional dense Khmer custard.

How do I know when the custard is fully cooked?

Insert a thin knife into the center of the custard through the top opening or through the side of the pumpkin. It should come out clean or with only a little thick custard attached. If liquid custard runs along the blade, it needs more time.

What is the best way to store leftovers?

Cover the cooled pumpkin tightly and refrigerate it for up to 3 days. The custard will firm up further in the refrigerator. Cut it into slices while it is cold for the cleanest portions, or scoop it out with a spoon if you prefer a softer texture.

Is this dessert gluten-free?

The ingredients in this recipe—pumpkin, egg yolks, coconut milk, palm sugar, and salt—do not contain gluten. However, if you are cooking for someone with celiac disease or a severe gluten sensitivity, always check the labels on your coconut milk and palm sugar to confirm they have not been processed in a facility with gluten.

Final Thoughts

Sankhya Lapov is the kind of dessert that looks impressive but asks very little of the cook. The pumpkin does most of the work, holding the custard and turning tender in the steam, while the egg yolks and coconut milk quietly set into something smooth and rich. Serve it in thick wedges, with the soft pumpkin flesh clinging to each slice of custard, and let the palm sugar and salt do their simple, balanced thing. It is a gentle introduction to Khmer sweets, and a good reason to keep a small pumpkin on the counter.