
Edit: Tried it a second time. Cake two had now 2.5 spoons of baking powder. It also did not rise, though its soft...but it tastes...bitter and sour to the same time.
The bitterness is from the alkalinity of the baking powder. If you get that flavour it means you have too much baking powder. 2.5 spoons is far too much. 3/4 of a teaspoon should be enough.
The problem may be:
- The basin was unsuitable -- It was either too wide or it had tapered sides, which would prevent it from rising properly.
- Mixture was too sloppy -- You could see it bubbling as it cooked, and the end result was a heavy, damp and stodgy mess. Use less water.
- Mixture was too thick -- The pudding rose a little but the end result was tough like rubber. Use more water.
I hope you have more luck on your next attempt.

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