Spiced latte cake recipe

Ingredients

• 250 g unsalted butter, melted
• 300 g self-raising white flour
• 1 tsp baking powder
• 250 g light brown soft sugar
• 1/2 tsp ground nutmeg, plus a pinch more
• 0.2 tsp salt
• 1 tbsp instant coffee powder, plus 1tsp
• 75 ml whole milk
• 275 g low-fat fresh vanilla custard
• 3 medium eggs, beaten
• 4 tbsp golden caster sugar
• 2 tbsp dark rum
• 200 ml whipping cream