Heat the butter, and add the curry paste. Gently fry the potato, leek, and shallots for a few minutes.
Add enough water to cover. Salt well, bring to boil, cover with a lid and lower the heat. Cook until the potatoes are soft.
Blend the soup, either in a blender or with an immersion blender, until smooth. Add the coconut milk. Using the coconut milk can add 1 1/2 cans water. Add more water if you want a thinner soup.
Add smoked cayene ( or chilli powder if you want it a little hotter)
Season to taste
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