Mix the flour, cocoa powder, baking powder, salt, and sugar. In a separate bowl, whisk together the eggs, milk, and walnut oil. Then combine the wet and dry ingredients, and only add the boiling water at the end. Pour the cocoa-scented, thin batter into a greased or parchment-lined high-sided cake tin about 16 cm in diameter.
Bake in a preheated oven at 180°C for 50 minutes, then let cool. For the icing, whisk together the powdered sugar, yogurt, and blue grape juice, then drizzle it over the cooled cake.
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