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Preheat oven to 350°F/177°Grease and line a 6-inch round pan. Set aside.
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In a bowl, mix together butter, eggs, water, and cake mix.
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Pour cake batter into prepared cake pan.
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Bake in the preheated oven for 18-20 minutes or until cake is set and lightly golden brown. Let it cool. And set aside.
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Prepare caramel sauce, in a small nonstick saucepan, melt brown sugar, once melted carefully pour in cream. Mix until sugar is dissolved, mix in butter and vanilla. Stir until smooth.
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Transfer cooled cake in a 6 x 2.5- inch tin can.
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Pour prepared caramel sauce onto cooled cake, top with salt. Serve