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Prepare corn. If you are using fresh corn, cut the kernels off the cobs and put the kernels in a bowl. If you are using frozen corn, defrost.
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Heat olive oil in a large soup pot and add sliced shallots, garlic, ginger, and chile and saute. Stir the mixture and saute until the vegetables are fragrant. This will take about 3 to 5 minutes. Add corn kernels to the mixture and continue cooking for about 3 more minutes. You want the corn to begin to soften and to brighten in color.
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Add potato chunks and stir. Cook for 1 to 2 more minutes.
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Add the vegetable broth and the coconut milk and bring soup to a boil. Reduce the heat to a simmer, cover the soup pot and continue to cook for 8 to 10 minutes until the potatoes are tender all the way through.
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Ladle about half of the soup into a blender and blend until smooth. Return the blended soup to the soup pot. Thin with additional vegetable broth if necessary.
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Add lime juice and salt to taste. Ladle soup into bowls and garnish.