Preheat your oven to 350°F and grease the bottom of an 8-inch pan. Line with parchment paper, and do not grease the sides.
Place the cocoa powder and chopped chocolate in a medium bowl and pour over the hot half and half. Let sit for about 4-5 minutes.
Use a spoon or a fork to mix the ingredients together into a smooth paste. Set aside.
Measure the olive oil and warm it in te microwave for 60 seconds. Pour it into the cocoa mixture and stir until smooth.
In a separate bowl, sift together the flour, baking powder, baking soda, and salt, mix to blend. Set aside.
Measure the sugar and orange zest in your mixing bowl, then use a fork to rub the zest into the sugar.
Mix in the eggs and whip until light and airy.
Drizzle in the chocolate mixture and mix until fully incorporated.
Mix in the flour mixture then fold in the chopped candied oranges.
Pour the batter into the prepared pan and bake for 35-40 minutes in, over the middle oven rack.The cake is ready when a toothpick comes out of the center of the cake with a few moist crumbs.