Phoebe Wood's coconut chicken noodle soup

Name: Phoebe Wood's coconut chicken noodle soup
Cuisine: Asian, Thai
Ingredients: 800ml coconut milk; 1 x 1.4kg whole chicken; 1/4 cup (60g) brown sugar; 1/3 cup (80ml) fish sauce; Juice of 1 1/2 limes; 375g dried rice noodles, cooked according to packet instructions; Fried Asian shallots, to serve; Toasted coconut flakes, to serve; Thinly sliced red onion, to serve; 1 lemongrass stalk (white part only), roughly chopped, stem reserved; 3 garlic cloves; 8cm piece (40g) young ginger, roughly chopped; 2 kaffir lime leaves, stalks removed; 1 bunch coriander, roots and stems washed, leaves reserved to serve; 1.5cm piece (20g) fresh turmeric, peeled; 4 long red chillies; 3 tsp belacan (roasted shrimp paste); 2 tsp tamarind puree; 1/2 cup (125ml) sunflower oil