Step 1Heat the oven to 350 degrees. Lightly grease a 9-inch round cake pan with butter and line it with parchment paper.
Step 2Sift together the flour, cocoa, sugar, baking soda, baking powder and salt into a mixing bowl. Stir until the ingredients are blended.
Step 3Combine the baby food puree, vanilla, egg substitute and milk. Stir it into the dry ingredients until they're almost blended.
Step 4Combine the espresso powder and boiling water and stir the liquid into the batter just until the ingredients are blended.
Step 5Pour the batter into the cake pan and bake the cake until a toothpick inserted in the center comes out clean, 30 to 35 minutes. Cool the cake in the pan 10 minutes.
Step 6Invert it onto a wire rack to cool a little more, then place the warm cake on a serving plate. Sprinkle the top of the cake with some cocoa powder and instant coffee. Cut the cake into slices and serve each piece with a few raspberries.