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Preheat oven to 350°F.
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Use a 8 x 4 x 2 1/2" loaf pan, (4 cups) or any 6 cup loaf pan or fluted tube pan, greased and floured.
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In a medium mixing bowl whisk together the cocoa and water until smooth.
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Allow to cool to room temperature and lightly whisk in the vanilla and eggs.
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In a large mixing bowl combine the remaining dry ingredients and mix on low speed for 30 seconds to blend.
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Add 1/2 the chocolate mixture and the butter.
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Mix on low speed until the dry ingredients are moistened.
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Increase to medium speed and beat for 1 minute to develop the cake's structure. Scrape down the sides.
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Gradually add the remaining chocolate mixture in 2 batches, beating 20 seconds after each addition to incorporate the ingredients and strengthen the structure. Scrape down the sides.
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Scrape the batter into the prepared pan and smooth the surface with a spatula.
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The batter will be almost 1/2 inch from the top of a 4-cup pan.
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(if your pan is slightly smaller, use any excess batter for cupcakes.) Bake for 50 to 60 minutes, (40 to 50 minutes in a fluted tube pan) or until a wooden toothpick inserted in the center comes out clean.
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Place loosely with buttered foil over the cake after 20 minutes to prevent over browning.
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The cake should start to shrink away from the sides of the pan only after removal from the oven.
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Let the cake cool in the pan on a rack for 10 minutes.
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Loosen the sides with a metal spatula and invert onto a greased wire rack.
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If baked in a loaf pan, to keep the bottom from splitting, reinvert so that the top is up and cool completely before wrapping airtight.
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TOPPING: This is for extra moistness and gives a subtle coffee accent.
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In a small pan, stir together 1/4 cup water and 2 Tbsp sugar.
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Bring to a full rolling boil.
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Cover and remove from heat. When cool, add 1 tbsp Kahlua.
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When cake is baked, brush half the syrup onto the top.
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Cool the cake 10 minutes and invert it onto a lightly greased rack.
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Brush the bottom and sides with remaining syrup.
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Reinvert onto rack, top side up, to finish cooling.