The sweetness of brown sugar and treacle in this comforting winter pudding is perfectly balanced by the tartness of rhubarb. The quantities of glacé ginger can be adjusted to taste.
Preheat the oven to warm 170°C (325°F/Gas 3). Grease a round 20 x 6 cm (8 x 2½ inch) cake tin and line the base with a circle of baking paper. Half-fill a pan with water, bring to the boil, then remove the pan from the heat.