Soak dried chilies in warm water for 15 minutes until softened, then drain.
Pound or blend chilies, garlic, lemongrass, turmeric, shrimp paste, and black peppercorns in a mortar and pestle or food processor until a smooth paste forms.
In a large pot, bring coconut milk and coconut cream to a gentle simmer over medium heat.
Add curry paste and stir well to combine, simmering for 5 minutes until fragrant.
Add kaffir lime leaves and continue simmering for another 5 minutes.
Gently add fish pieces to the curry and cook for 8-10 minutes until fish is just cooked through.
Season with salt and adjust to taste.
Serve immediately with steamed rice or rice noodles.