Enchantress Bombe from Sweet Dreams by Josceline Dimbleby

Ingredients

• the yolks of 4 large eggs (size 2)
• 4 oz (100 g) caster sugar
• 1 large egg (size 2)
• 1 teaspoon (5 ml spoon) baking powder
• butter, for greasing
• ½ teaspoon (2.5 ml spoon) salt
• 4 oz (100 g) cornflour
• 5 tablespoons (5 x 15 ml spoon) dark rum
• 3 tablespoons (3 x 15 ml spoon) orange juice
• 4 oz (100 g) demerara or soft pale brown sugar
• finely grated rind and juice of 2 medium-size oranges
• 6 oz (175 g) caster sugar
• the whites of 4 large eggs (size 1–2)