Instructions
Soaking time 30 minutes
To make broth, soak chillies in boiling water for 30 minutes or until softened, then drain. Place in a food processor with eschalots and garlic, and process to a smooth paste. Set aside.
Heat oil in a large saucepan over medium heat. Add dried shrimp and cook, stirring, for 3 minutes or until fragrant. Add prawn shells and heads, including the reserved shells and heads from the cooked prawns (you should have 800 g all together), and cook, stirring, for 7 minutes or until shells turn pink. Add reserved chilli paste and stir for 2 minutes or until fragrant, then add bones, palm sugar and 2.5 L water (or enough to just cover mixture). Bring to a simmer over high heat, skimming surface to remove impurities, then reduce heat to low and cook for 1½ hours, skimming surface occasionally. Add pork neck and cook for a further 1 hour or until tender. Remove pork neck from broth, cool slightly, then thinly slice. Discard bones.
Remove prawn shells and heads from broth with a slotted spoon and transfer to a food processor with 250 ml broth. Process until coarse (add more broth to loosen mixture, if necessary). Strain through a fine sieve and return to pan, pressing solids to extract liquid. Discard solids. Cover broth and keep warm.
Meanwhile, to make chilli sauce, soak dried chillies in boiling water in a small bowl for 30 minutes or until softened, then drain. Transfer to a food processor with remaining ingredients and process to a smooth paste. Heat a small saucepan over medium heat. Add paste and cook, stirring, for 15 minutes or until a deep red colour. Remove from heat and set aside to cool.
Bring a large saucepan of water to the boil. Add kangkong and sprouts, and cook for 1 minute or until wilted. Remove with tongs and drain, reserving cooking water. Return water to the boil, then add rice vermicelli noodles and cook for 3 minutes or until softened. Add egg noodles, using chopsticks to separate, and cook for 1 minute or until heated through. Strain noodles and divide among 6 large bowls. Top with kangkong, bean sprouts, eggs, pork neck and prawns, then ladle over warm broth. Scatter with fried eschalots and serve with chilli sauce.