Steamed saffron sponge with burnt mandarin custard

Name: Steamed saffron sponge with burnt mandarin custard
Prep time: 15 min
Cook time: 1 h 30 min
Total time: 1 h 30 min
Yield: 6 portions
Ingredients: 5 mandarins; 300 g milk; 150 g thickened cream; 10 g cornflour; 4 egg yolks; 1 vanilla pod; 60 g sugar; 3 tbsp water; 2 tbsp orange liqueur; 1 pinch saffron threads; 80 g raw sugar; 100 g unsalted butter; 2 eggs; 50 g sour cream; 30 g apricot jam; 1 pinch saffron threads; 100 g self-raising flour; ½ tsp ground cinnamon; ½ tsp bicarbonate of soda; 2 pinches sea salt; 1 pinch ground black pepper; 600 g water; micro herbs