Black Treacle Sponge: Sticky, Steamed & Simple

Black treacle sponge is a deeply comforting British pudding: a soft, airy steamed sponge cake made rich and dark with black treacle (the UK name for dark molasses), then drenched in a warm, sticky treacle sauce. It works because the treacle’s bittersweet, almost smoky flavor balances the cake’s sweetness, and steaming—rather than baking—keeps the crumb exceptionally moist. Serve it straight from the steamer with custard or cream for a dessert that feels both nostalgic and impressive.

Ingredients

1 cup (2 sticks / 225 g) unsalted butter, softened, plus extra for greasing
1 cup (200 g) light brown sugar, packed
3 large eggs, at room temperature
1/2 cup (120 ml) black treacle (or dark molasses)
2 cups (250 g) all-purpose flour
2 tsp baking powder
1/2 tsp ground ginger
1/4 tsp salt
1/4 cup (60 ml) whole milk
For the sauce: 1/2 cup (120 ml) black treacle, 1/4 cup (50 g) light brown sugar, 1/4 cup (60 g) unsalted butter, 1/4 cup (60 ml) heavy cream

Instructions

Generously butter a 2-pint (1.2 L) pudding basin or heatproof bowl. Place a small circle of parchment paper at the bottom.
In a large bowl, beat the butter and sugar together until pale and fluffy, about 3 minutes with an electric mixer.
Beat in the eggs one at a time, adding a spoonful of flour if the mixture starts to curdle. Then beat in the black treacle until fully combined.
Sift the flour, baking powder, ginger, and salt over the mixture. Fold gently with a spatula until just combined, then stir in the milk to loosen the batter. It should drop easily from a spoon.
Spoon the batter into the prepared basin and smooth the top. Cover with a piece of buttered parchment paper and a sheet of foil, pleated in the center to allow for rising. Secure tightly with kitchen string.
Place a trivet or an upturned small plate in the bottom of a large pot. Set the basin on top. Pour boiling water into the pot until it comes halfway up the sides of the basin. Cover the pot with a lid.
Steam over a gentle simmer for 1 hour 45 minutes, topping up with boiling water as needed. The sponge is done when a skewer inserted into the center comes out clean.
While the sponge steams, make the sauce: in a small saucepan, combine the treacle, brown sugar, and butter. Heat gently, stirring, until the sugar dissolves. Remove from heat and stir in the cream.
Carefully remove the basin from the pot. Let it rest for 5 minutes, then run a knife around the edge and invert onto a serving plate. Pour the warm sauce over the top and serve immediately.

Tips

Substitute for black treacle: If you can’t find black treacle, use dark molasses (not blackstrap, which is too bitter) or a mix of 3 parts dark corn syrup to 1 part molasses. The flavor will be slightly less complex but still delicious.
Don’t overmix: Once the flour is added, stir only until no streaks remain. Overmixing develops gluten and makes the sponge tough.
Keep the water simmering, not boiling hard: A vigorous boil can cause the water to splash over the basin and make the sponge soggy. Maintain a gentle simmer and check the water level every 30 minutes.
Make ahead: The steamed sponge can be kept in the basin, wrapped tightly, in the fridge for up to 3 days. Reheat by steaming for 30 minutes or microwaving individual slices.

Serving Suggestions

Serve the sponge hot with the treacle sauce poured over generously. Traditional accompaniments include cold, thick custard, vanilla ice cream, or lightly whipped cream. The contrast of warm, sticky sponge with cold, creamy custard is classic. For a British pub-style finish, add a spoonful of clotted cream on the side.

Variations

Golden Syrup Sponge: Replace the black treacle with golden syrup for a lighter, caramel-like flavor. Use the same quantity.
Citrus Treacle Sponge: Add the zest of one orange or lemon to the batter along with the treacle. The citrus brightens the deep molasses flavor.
Spiced Treacle Sponge: Increase the ground ginger to 1 teaspoon and add 1/2 teaspoon ground cinnamon and a pinch of nutmeg for a warm, autumnal version.
Individual Puddings: Divide the batter among 6 buttered ramekins (about 1-cup capacity). Steam for 35–40 minutes, or until a skewer comes out clean.

Storage and Reheating

Leftover sponge (without sauce) keeps in an airtight container in the refrigerator for up to 4 days. To reheat, steam individual slices for 10–15 minutes, or microwave on medium power in 30-second bursts until warmed through. The sauce can be refrigerated separately for up to 1 week and reheated gently on the stove or in the microwave. The sponge also freezes well for up to 3 months—wrap tightly in plastic wrap and foil, then thaw overnight in the fridge before reheating.

Frequently Asked Questions

What is black treacle exactly? Black treacle is a thick, dark syrup made during sugar refining—essentially the British term for dark molasses. It has a robust, slightly bitter flavor with notes of caramel and smoke. It’s less sweet than golden syrup and more intense than light molasses.

Can I bake this instead of steaming? Yes, you can bake it in a loaf pan at 350°F (175°C) for about 50–60 minutes, but the texture will be drier and less tender than the steamed version. Steaming is what gives the sponge its characteristic moist, light crumb.

Why did my sponge sink in the middle? This usually happens if the steamer lid was lifted too often, letting steam escape and causing the temperature to drop. Try to keep the lid on as much as possible, and make sure the water is simmering gently, not boiling rapidly.

Can I use a silicone pudding basin? Yes, silicone basins work well—they don’t need greasing as much, and you can skip the parchment paper step. Just make sure to place it on a stable trivet and cover it with foil as usual.

Is black treacle the same as molasses? In the US, black treacle is closest to dark molasses (not blackstrap). Blackstrap is too bitter and will overpower the pudding. If you only have blackstrap, use half blackstrap and half golden syrup or light corn syrup.

Can I make this dairy-free? Yes, substitute the butter with a plant-based margarine or coconut oil, and use a non-dairy milk like oat or almond. For the sauce, use a dairy-free butter alternative and coconut cream instead of heavy cream. The texture will be slightly different but still delicious.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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