To make the "magic sauce", toast the cumin and coriander seeds in a frying pan over medium, heat until fragrant. Set aside to cool. Once cooled add to a food processor and process until a powder forms. Add the remaining ingredients and process until you have a smooth paste. Decant into a clean jar and refrigerate.
To make the soup, heat a large saucepan over medium heat. Add the olive oil and onions along with a pinch of salt. Fry the onions until golden. Add 2 tbsp of the "magic sauce", and cook for 1 minute or until fragrant. Add the pumpkin and toss in the onions and sauce and allow to brown slightly.
Add the vegetable stock and beans. Bring to a boil, before reducing to a simmer for 10 minutes, or until the pumpkin is tender. Add the coconut milk and cook for another 5 minutes.
Remove the saucepan from the heat and, using a hand held blender, blend the soup until smooth. Serve with a drizzle of coconut milk and fresh cilantro.