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1 large jalapeño
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1 tablespoon sherry vinegar
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1/2 teaspoon sugar
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2 tablespoons unsalted butter
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1/2 Vidalia onion, finely chopped (about 1 cup)
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3 cups frozen corn kernels or 1 pound fresh corn kernels
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1 large garlic clove, minced
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4 cups chicken stock or canned low-sodium broth
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Salt and freshly ground pepper
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2 tablespoons crème fraîche
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8 frozen plum tomato halves, coarsely chopped, or 4 fresh plum tomatoespeeled, halved lengthwise, seeded and coarsely chopped
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1 scallion, thinly sliced
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1 tablespoon finely chopped cilantro, plus more for garnish
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Roast the jalapeño on a skewer directly over a gas flame or in a pan under the broiler, turning, until charred all over. Transfer the jalapeño to a bowl, cover with plastic wrap and let steam for 10 minutes. Peel, core, seed and finely chop the jalapeño. In a small bowl, combine the jalapeño with the vinegar and sugar and stir until the sugar dissolves.
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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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Using a slotted spoon, transfer 1 1/2 cups of the corn to a blender, add the crème fraîche 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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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 jalapeño and a drizzle of the chile vinegar. Serve hot.
Make Ahead
The soup can be prepared through Step 3 and refrigerated for up to 2 days. Reheat before proceeding.
Suggested Pairing
Sweet, succulent corn has a particular affinity for a creamy-textured Chardonnay. Pick a lighter example, such as one from Oregon or Washington State.