1. Dissolve the cocoa powder in the lukewarm water. Sift the flour, baking soda, and baking powder. Beat the vegetable butter with the sugar, eggs, and vanilla.
2. Add all the ingredients and mix gently. Divide the batter into 3 small baking pans or one larger one and bake in a moderate oven at 170°C for 35-40 minutes.
3. Let them cool and cut the cake layers in half. Or the large one into 3 layers. Drizzle lightly with orange liqueur, or if you don't have any, with a little syrup.
4. Beat all the ingredients for the orange cream in a mixer. Place one cake layer. Drizzle with orange liqueur.
5. Spread 1/3 of the orange cream. Repeat with the remaining layers and decorate with the chocolate bars and orange segments.
