Preheat the oven to 180c/350F.
Line a baking tray with baking paper (I used a 25x25cm tin).
Melt the butter in a saucepan on a very low heat.
When it's starting to melt, add in the dark chocolate, milk chocolate and the sugar. Stir until it's all melted together.
Once melted, remove from the heat and leave to cool for 5-10 minutes.
Beat in each egg, one by one.
Stir in the flour.
Chop one-and-a-half of the Terry's Chocolate Oranges into large chunks and stir into the brownie batter, along with the orange zest.
Pour into your baking tin and top with the remaining Chocolate Orange segments.
Bake for 20-25 minutes, or until the edges are just solid but the middle still has a little wobble. Don't overbake them!
Ovens do vary so don't be alarmed if you recipe takes that little bit longer. Brownies are better under-done than over.
Allow to cool COMPLETELY before cutting up (if you can bare it!)
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