Preheat oven to 200 degrees C. Line a baking tray with foil.
Cut the pumpkin into slices. Lay on the baking tray, brush with oil and sprinkle with rosemary. Bake 15 minutes, or until pumpkin is soft. Remove from oven, let cool, dice and place the flesh in a saucepan.
Add the coconut, ginger, curry, lemongrass and chilli. Simmer until pumpkin is very tender - you may need to add a little water if it is too thick.
Blend well, reheat and season with soy sauce. Serve!