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Preheat the oven to 340 F. Line a loaf pan with cling film.
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Combine the flour, soda, 50 g cocoa, 275 g sugar, butter, eggs, vanilla, and sour cream until smooth.
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Pour in ½ cup boiling water. Stir well. Mix in 175 g of the chocolate. Pour this into the prepared pan and bake 1 hour.
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Combine 1 tsp cocoa, 125 ml water, 100 g sugar, and boil for 5 to 10 minutes until reduced and syrupy.
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Take the cake out of the oven and while still in the pan, pierce some holes in it. Pour in the syrop.
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Cool completely and then remove the cake from the pan. Serve in slices.