Butterscotch Banana Sponge Pudding

Name: Butterscotch Banana Sponge Pudding
Prep time: 15 min
Cook time: 1 h 5 min
Total time: 1 h 5 min
Yield: 8 portions
Ingredients: 85 g unsalted butter; 140 g caster sugar; 175 g self-raising flour; 1 banana; 150 g milk; 1 large egg; ¼ tsp fine sea salt; 1 tsp ground cinnamon; 1 tsp natural vanilla extract; 50 g unsalted butter; 130 g light brown sugar; 30 g golden syrup; 250 g water; 1 banana