Food & Cooking Recipes Dessert & Treats Recipes Fleur de Sel Toffee 3.6 (53) 5 Reviews By Martha Stewart Editors Martha Stewart Editors Facebook Instagram Twitter Website An article attributed to "Martha Stewart Editors" indicates when several writers and editors have contributed to an article over the years. These collaborations allow us to provide you with the most accurate, up-to-date, and comprehensive information available.The Martha Stewart team aims to teach and inspire readers daily with tested-until-perfected recipes, creative DIY projects, and elevated home and entertaining ideas. They are experts in their fields who research, create, and test the best ways to help readers design the life they want. The joy is in the doing. Editorial Guidelines Updated on May 16, 2017 Print Share Share Tweet Pin Email Yield: 2 pounds Calling for a pound of butter, this salty-sweet confection defines indulgence. But it's worth every ounce. Get the packaging how-to for Fleur de Sel Toffee. Ingredients Vegetable oil, cooking spray 1 pound (4 sticks) unsalted butter 2 ⅔ cups sugar ⅓ cup water ¼ cup light corn syrup Fleur de sel, for sprinkling Directions Coat a rimmed baking sheet with cooking spray. Bring butter, sugar, water, and corn syrup to a boil in a large saucepan, whisking frequently until sugar dissolves and butter melts. Cook, undisturbed, until mixture registers 300 degrees on a candy thermometer, about 12 minutes. Whisk toffee mixture, then immediately pour onto prepared sheet, tilting pan to spread over entire surface. Let stand for 30 seconds, then sprinkle with fleur de sel. Let cool. (Do not move the pan for first 30 minutes.) Break toffee into pieces. Cook's Notes Toffee will keep, covered, for up to 1 week. Print