About halfway through pumpkin cooking, heat oil in a medium pan over medium heat.
Add curry paste and cook for 1 minute, until fragrant.
Stir in coconut cream, kaffir lime leaves, and red chilli. Bring to a gentle boil.
Add fish sauce and brown sugar. Reduce heat and simmer for 15 minutes, until slightly thickened.
Pour in coconut milk and simmer for another 5 minutes.