Chop pumpkin into chunks. Put in pot with water and bring to a boil.
Pound shallots, fresh turmeric, chillies and anchovies into a rough paste.
Once the pumpkin is about 2/3 cooked, put in paste and some salt.
Let it simmer gently.
Add in turmeric leaves, prawns and French beans.
Turn stove low and slowly pour in coconut milk, stirring constantly.
Adjust taste with more salt if necessary.