Preheat oven to 350F. Line an 8-inch round cake pan with parchment paper and lightly grease.
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In a large bowl, sift together flour, cocoa powder, sugar, baking soda and salt. Pour in the rest of the ingredients and stir until just combined. Pour into prepared pan.
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Bake for 45-50 minutes, until a tester comes out clean or with only a few moist crumbs attached.
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Allow cake to cool in pan for 10 minutes, then turn out onto a wire rack. Remove parchment circle from cake, then reinvert cake on rack to cool completely before filling.