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Heat the oil in a heavy-based frying pan and add the red curry paste. Fry for 2 mins, then add the sugar and cook for 4 mins until sticky and fragrant.
Add the squash, stir well and cook for 2-3 mins, then pour in the coconut milk and the coconut cream, season with the fish sauce and add the lime pickle and lemongrass. Bring to the boil and cook for about 25-30 mins over a medium heat until the squash is soft but not mushy.