Curry Paste:
Blend all ingredients together in Thermomix on speed 6. Scrape down and blend again until mixture becomes a paste. (Or place in a food processor and blend)
Curry:
Heat oil in pan and add spice mixture, stirring for about 2 minutes until fragrant.
Add the curry paste and cook out for a few minutes.
Add coconut cream and bring to the boil.
Cook, stirring regularly until coconut milk begins to split - 4 to 5 minutes.
Add stock, sauce and sugar, if using.
Add diced pumpkin and bring to the boil.
Simmer gently for around 25 minutes or until pumpkin is tender.
Add lentils to heat through.
Finish with a sprinkling of chopped reserved coriander leaves.