There's reduced mandarin juice in the white chocolate ganache, and mandarin zest in the shell.
And I found out the secret of getting the really bright colours.
You use a lot of food colouring. Who knew? This is half a teaspoon or so of orange Wiltons gel food colouring.
And the way to stop the cracking was to turn the oven DOWN. I was using 140 (fan forced) and I dropped it to 120 degrees. I also popped a thermometer into the oven, to see what temperature it was REALLY at. Turns out that 120 on the dial, and fan forced, gives us 140 in the oven. And I baked only one tray at a time (there were 7 trays!). Watched Flash Gordon while I shuffled trays.
Now the issue is the big air pocket under the perfect top of the shell. Look at that top macaron in the stack - some of them you can see right through! So that's not perfect. We're in the right ballpark though.


That rotten old grid paper I've used is actually pristine new cardstock, stamped with two paper-aging stamps - one has a grid design, and the other has aged edges that match. Sigh. There's even a hole! And the fruit comes from another set. 
