1: Heat the oil in a large non-stick saucepan over a high heat. Add the onions and cook for 5 minutes, adding a splash of water if they start to stick.
2: Add the lemongrass, garlic, ginger and red chilli and cook for 2 minutes, then stir in the curry paste and cook for another 1–2 minutes, until fragrant.
3: Add the butternut squash, veg stock and fish sauce and bring up to a gentle simmer. Put a lid on the pan and simmer gently for 25 minutes or until the squash has softened.
4: Pour in the coconut milk, stir well and cook, uncovered, for a further 5 minutes.
5: Using a jug blender, blitz the soup in batches until smooth. Return to the pan and place over a gentle heat. If the soup is a little thin, simmer for a few minutes more; if it’s too thick, add a splash more water.
6: Taste the soup and season with salt and pepper if needed. Divide between warmed bowls and top with sliced red chilli and chopped coriander. Grind a little extra black pepper over each serving too.
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