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1
Line the bottom of an 8-inch square baking pan (or loaf pan) with parchment paper, then brush the paper lightly with oil, allowing the paper to drape over 2 sides.
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2
In a deep saucepan (6 inches diameter by 4 1/2 inches deep) combine the sugar, corn syrup, and 1/2 cup water and bring to a boil over medium-high heat. Continue to boil until the caramel is a warm golden brown color. Don't stir - just swirl the pan to mix. Watch carefully, as it will burn quickly at the end!
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3
In the meantime, bring the cream, butter, and 1 teaspoon fleur de sel to a simmer in a small pan over medium heat. Remove from the heat, set aside and keep warm.
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4
When the caramelized sugar is the right color, slowly add the cream mixture to the caramel - it will boil up violently. Stir in the vanilla with a wooden spoon and cook over medium heat for 5 to 10 minutes, until the mixture reaches 248 degrees F (firm ball) on a candy thermometer. Very carefully (it's hot!) pour the caramel into the prepared pan and refrigerate until firm.
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5
When the caramels are cool, use the parchment paper to pry the sheet from the pan onto a cutting board. Starting at 1 end, roll the caramel up tightly until you've rolled up half of the sheet. Cut the sheet across and then roll the second half tightly. You will have 2 (1 by 8-inch) logs. Sprinkle both logs lightly with fleur de sel, cut each log in 8 pieces. Cut parchment papers in 6 by 4 1/2-inch squares and wrap each caramel in a paper, twisting the ends. Store in the refrigerator or at room temperature.
