Whizz the chillies, onion, ginger and garlic with a splash of water to a purée in a small food processor or blender.
Heat 1 tbsp of oil in a lidded pan. Cook the cumin and fenugreek until they start to pop. Stir in the onion purée, season, turn the heat down and cook for 5 minutes.
Add the turmeric and peppercorns, and stir before adding the coconut milk. Simmer gently with a lid on for 15 minutes. Add the prawns and cook for 3-4 minutes or until pink. Scatter over the coriander and serve with rice.
*This recipe is gluten-free according to industry standards