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["Prepare 2 9in cake pans by buttering, lining with parchment paper and flouring.", "Preheat oven to 350 F degrees.", "In the bowl of your stand mixer, cream together the butter and sugars for about 3 minutes.", "Add the eggs, one at a time and mix until incorporated. Scrape the sides of the bowl often.", "Mix in the vanilla.", "Add the flour and buttermilk alternating until just combined.", "In a small bowl, mix together the baking soda and vinegar then add to the batter. Mix just until incorporated. Do not overmix!", "Separate batter evenly into the two prepared cake pans", "Bake about 20 minutes or until the top and edges are golden brown and a toothpick comes out clean", "Cool in pans for 5 minutes before removing to a wire rack to cool completely", "For the Caramel Sauce: In a very large, heavy saucepan or pot over medium-high heat, pour the sugar in an even layer over the bottom of the pan. Whisk until melted. The sugar will clump up but will eventually completely melt. This will take about 4-5 minutes.", "Once the sugar has melted, stop whisking and cook until the temperature reaches 350 F degrees or the sugar has turned into an amber color and has a nutty aroma. Remove from the heat.", "Add all the butter and whisk until combined. This mixture will bubble up, but keep whisking until all the butter has melted.", "Slowly pour the heavy cream into the mixture and whisk until incorporated.
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Cool for about 10-15 minutes before using. Store leftovers in a jar with a lid and reheat before using again. Refrigerate up to 2 weeks.", "For the Frosting: In a medium, heavy pot, whisk together the brown sugar and 2oz of butter over medium heat until melted. Bring to a boil for no more than 10 seconds. Remove from heat immediately and pour in the heavy cream and whisk until smooth. Cool to room temperature.", "In the bowl of your stand mixer, cream together the remaining 3oz of butter and cream cheese until smooth. Scrape the sides of the bowl several times during this process. Mix in the salt.", "Turn the mixer to low and pour in a slow, steady stream the brown sugar mixture. Scrape the sides of the bowl and mix on medium speed until completely smooth and incorporated. Add the sifted powdered sugar and mix on medium speed until smooth.The frosting will feel very soft - so refrigerate it for 10-15 minutes before frosting the cake.", "Once the cakes cooled, use a large skewer to poke holes across the top of the cake. Spoon a layer of caramel sauce over the top of the cake and use an offset spatula to spread it evenly. Allow the caramel sauce to soak into the cake Once all the caramel has soaked into the cake, add a layer of the cream cheese frosting.", "Place the second layer of cake on top and spread another thin layer of frosting on top and sides. Refrigerate for 20 minutes or until the ""crumb coat"" is set. Frost the cake with the remaining frosting and then top with a layer of caramel sauce on the top only pushing to the edge with the off set spatula so the excess oozes down the sides. Top with a sprinkle of fleur de sel. Refrigerate until ready to eat - but remove 15 minutes before serving."]
