Chocolate Orange Cake Explosion

Made this for my friends as a collective birthday cake. Went down a treat. Plus dark chocolate is good and it has an orange in it which is one of your 5 a day, so must be good for you (not a doctor).

125g Dark Chocolate, broken into pieces
1 ½ tbsp Cocoa Powder, sifted
1 tsp Baking Powder, sifted
250g Plain Flour, shifted
3 Large Eggs
250ml Sunflower Oil
275g Golden Caster Sugar
1 Juice and Zest of a Large Orange

Topping (Ganache)
200g Dark Chocolate
200ml Double Cream
25g Dark Chocolate, grated (optional)
Chocolate Orange Wedges (Popular Branded ones)

1.  Line a 8 inch cake tin with greaseproof paper. Preheat the oven to 180c/160c fan assisted.

2. In a bowl mix, mix the sugar, oil and eggs together. Then add the orange juice and zest to the bowl and give another mix.

3. In either a bain marie or a microwave, melt the dark chocolate. In a ban marie continue to stir so it doesn't burn. If you choose to melt the chocolate in the microwave, heat for a minute, give a stir and heat for a further minute, continue the process until the dark chocolate is melted.

4. Allow the chocolate to cool slightly and add this to the mixture. When combined add the flour, cocoa powder and baking powder. 

5. This should thicken the cake mixture. Pour into the cake tin and put in the oven for 45-55 minutes. Check the centre of the cake with a skewer to see if it's baked all the way through. Put on a rack to cool. 

6. While the cake is cooling make the Chocolate Ganache. To do this heat the cream in the pan. When it starts to boil take off the heat. Put the chocolate in a heat proof dish and pour over the heated cream and begin to stir until fully combined. Leave to cool slightly.

7. Decorate the cake by pouring the ganache over the cake (make sure you have a plate underneath the rack to catch the chocolate). Place chocolate orange wedges on the cake. Grate with chocolate. Place in container (on a cake board or plate). Place in fridge to allow ganache to harden. Serve