In a medium saucepan, heat butter over medium heat. Add onion, garlic, pumpkin, carrots, potato, curry leaves, cumin seed, lemongrass and cook, stirring, for about 2-3 minutes.
Add flour, coriander leaves and cook for another minute, stirring, stock or water. Add 1 sachet MAGGI Coconut Milk powder, mix well and bring to the boil, then reduce to a simmer.
Remove from heat and carefully blend using an immersion blender.
If needed, heat again over low heat to warm through.
Add salt to taste and garnish with thick coconut cream.