Weigh out the softened butter, caster sugar, flour, eggs and milk in a bowl and beat well until smooth.
175 g butter, 175 g caster sugar (superfine sugar), 175 g self-raising flour, 3 medium eggs, 3 tsp milk
Grease a pudding bowl with butter, then add the golden syrup in the base of the bowl.
5 tbsp golden syrup
Spoon the sponge mixture on top of the golden syrup and smooth the top. Use clingfilm to seal the pudding bowl.
Get your slow cooker ready. Note: I use my large 5.7 litre Crockpot for this recipe, as I can get a 1 litre pudding bowl in there with plenty of free space.Boil a kettle and pour the boiling water (two to three inches deep) into the slow cooker ceramic pot.Place the pudding bowl, covered with clingfilm, into the water. Place the lid back on the slow cooker and cook on high for 2.5 hours, until the pudding has risen in the bowl and the top centre of it looks firm. Peel back the clingfilm and check with a skewer or cake tester to ensure it is fully cooked through.
Invert the pudding onto a plate carefully, using oven gloves. Portion into bowls, drizzling with more golden syrup if you like, to serve. Serve warm with custard or cream.