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Preheat the oven to 190 C / 375°F.
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Grease and flour a 20 cm cake tin.
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Combine the flour, sugar, cocoa powder, bicarbonate of soda and salt.
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Make a well in the centre of the mixture, and add the vanilla essence, vinegar and oil, then gradually stir in the water.
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Continue stirring until thoroughly blended, but do not over-mix.
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Pour all of the batter into the cake tin, and bake, uncovered, for 35 to 40 minutes, or until a toothpick inserted into the centre of the cake, comes out clean.
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Do not over bake, the secret to this cake is its moistness.
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Cool in the tin on a wire rack for 10 minutes, then transfer the cake from the tin to the rack, to cool completely.
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Sift the icing sugar over the top, and serve.