Preheat your oven to 180°C. Grease a small baking dish or individual ramekins.

In a medium bowl, sift together the flour, sugar, cocoa powder, baking powder, and salt.

In another bowl, whisk together the milk, egg, melted butter, vinegar, and vanilla extract.

Pour the wet ingredients into the dry ingredients and mix until just combined.

Pour the batter into the prepared baking dish or ramekins. Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.

While the pudding is baking, combine the cream, sugar, butter, vanilla extract, and cocoa powder in a small saucepan. Heat over medium heat, stirring constantly, until the butter is melted and the sugar is dissolved.

When the pudding is done baking, poke holes in it with a skewer or fork. Pour the hot sauce over the pudding, allowing it to soak in.