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1
Roast the jalapeno on a skewer directly over a gas flame or in a pan under the broiler, turning, until charred all over. Transfer the jalapeno to a bowl, cover with plastic wrap and let steam for 10 minutes. Peel, core, seed and finely chop the jalapeno. In a small bowl, combine the jalapeno with the vinegar and sugar and stir until the sugar dissolves.
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2
Melt the butter in a large, heavy saucepan. Add the onion and cook over moderately high heat, stirring, until lightly browned, 6 to 7 minutes. Add the corn and garlic and cook, stirring, until the corn is lightly browned, about 5 minutes. Add the stock and simmer until the corn is tender, about 15 minutes. Season with salt and pepper.
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3
Using a slotted spoon, transfer 1 1/2 cups of the corn to a blender, add the creme fraiche and 1/2 cup of the cooking liquid and puree until smooth, about 2 minutes. Return the puree to the soup.
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4
Add the tomatoes, scallion and 1 tablespoon of cilantro to the soup and cook until heated through. Ladle the soup into 4 shallow bowls, garnish with cilantro, the jalapeno and a drizzle of the chile vinegar. Serve hot.
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5
Make Ahead: The soup can be prepared through Step 3 and refrigerated for up to 2 days. Reheat before proceeding.
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6
Wine Recommendation: Sweet, succulent corn has a particular affinity for a creamy-textured Chardonnay. Pick a lighter example, such as the 1998 Argyle Willamette Valley from Oregon or the 1998 Waterbrook from Washington State.
