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• 300 g / 10oz whole prawns / shrimp
• 3 cup (750 ml) water
• 1/2 cup (125 ml) chicken stock/broth
• 2 stalks lemongrass
• 1.5 cm / 3/5" galangal
• 5 kaffir lime leaves
• 2 Thai or birdseye chillies
• 3 garlic cloves
• 120 g / 4oz oyster mushrooms
• 1 roma tomato
• 1/2 white onion
• 1 tsp sugar
• 3 tbsp fish sauce
• 3 tbsp lime juice
• Coriander/cilantro
• 1 1/2 tbsp Thai roasted chili sauce
• 1/3 cup (75 ml) evaporated milk