Coffee crème caramel

Ingredients

• 150 g caster sugar
• 3 medium free-range eggs, plus 3 yolks
• 120 g soft light brown sugar
• 1 vanilla pod, halved, seeds scraped
• 300 ml double cream
• 300 ml whole milk
• 1 tbsp espresso instant coffee powder
• 50 ml Kahlúa liqueur (optional)
• 2 large oranges, segmented, to serve (optional)
• You will need also need a 1.2 L-capacity loaf tin, lightly oiled