Preheat the oven to 160° C w/ fan.
Mix flour, baking powder, cocoa, spice mix, dried/sugared orange zest, salt.
Whisk sugar w/ eggs, olive oil, milk, vanilla extract w/ a handheld electric mixer.
Incorporate flour mess & liquid mess; add the candied orange peel.
Slightly oil the bundt cake tin & pour the mess into the bundt cake tin.
Bake at 160° C w/ fan for about 40 min. Make the famous test w/ a wooden pin ... & adjust baking time (about 5-10 min) if the cake is not done.
Let the cake cool down in the bundt cake tin for about 10-15 min; afterwards turn it over to release the cake.
As soon as the cake is at room temperature melt the chocolate in an bain-marie & pour it all over the cake.
Let the chocolate icing set either in the fridge or at a cool place anywhere (e. g. on your deck?).