Treacle sponge pudding is a traditional British steamed dessert made with golden syrup or black treacle poured over a light, buttery sponge. The syrup soaks into the sponge as it cooks, giving every serving a rich, caramel-like sweetness. It comes together in about an hour and is best served warm with custard or cream.
Preheat the oven to 180°C/350°F (160°C Fan). Grease a 1.2-liter pudding basin with butter and line the bottom with a circle of baking paper for easy removal.
In a large mixing bowl, cream together the butter and caster sugar until the mixture is pale and fluffy. This should take about 3-4 minutes using an electric hand mixer.
Add the eggs one at a time, beating well after each addition. A smooth, homogenous mixture is key to a light sponge.
Gently fold in the sifted self-raising flour and baking powder using a spatula, ensuring everything is well combined without knocking out the air.
Add the milk to the mixture and stir until just incorporated. The batter should be smooth and drop from the spoon easily.
Pour the golden syrup into the prepared pudding basin, then gently spoon the sponge batter over it.
Cover the basin with a piece of baking paper and then a piece of foil, pleated in the middle to allow for rising. Secure with string under the lip of the basin.
Place the basin in a deep roasting pan and fill with boiling water to halfway up the sides of the basin. Carefully transfer to the oven and steam for 1 hour.
Remove the basin from the oven and let the pudding sit for a few minutes. Run a knife around the edge and invert onto a serving plate.
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Notes
For a richer flavor, substitute brown sugar for caster sugar. For dietary adaptations, use gluten-free flour and baking powder.