Steamed chocolate and prune puddings

Name: Steamed chocolate and prune puddings
Prep time: 20 min
Cook time: 1 h 30 min
Total time: 1 h 30 min
Yield: 18 portions
Ingredients: 50 g dark chocolate; 250 g pitted prunes; 1150 g water; 1 tsp bicarbonate of soda; 125 g butter; 200 g brown sugar; 3 eggs; 200 g self-raising flour; ½ tsp ground cinnamon; ¼ tsp ground cardamom; ¼ tsp ground cloves