PREP

1. Prepare an ice bath.
2. Put the finely chopped chocolate into a large bowl and set aside.
3. Peel off the zest of the orange being careful to avoid the white pith (you should have about 20g of zest). Blitz the zest with the sugar in a food processor.  After two or three pulses, the zest should be chopped but still recognizable and the sugar should be slightly damp with citrus oil – the smell will be incredible. 

MIX

1. Combine orange sugar, non-fat milk powder, cocoa powder, and tapioca starch. Mix milk and cream in a large bowl.  Whisk in the dry ingredients until there are no lumps. Thoroughly incorporate the corn syrup and egg yolks.

COOK

1. Place the mixture in a medium saucepan and cook for 8-10 minutes at medium-high. Heat until bubbles start forming around the edges but do not let it come to a full rolling boil.  Keep stirring the mixture.  In the last few minutes, the gelato will thicken. 
2. Once it’s thick enough to coat the back of a spoon, pour it through a fine-mesh strainer (straining out the orange zest)  into the bowl with the finely chopped chocolate.  Let it sit for 3-5 minutes then mix vigorously, scraping the melted chocolate off the bottom.  It may take a few minutes of mixing before the chocolate is completely incorporated (there should be no visible pieces of the chopped chocolate left) 
3. Place a piece of plastic wrap on the surface of the gelato to prevent a skin from forming. Put the bowl of hot gelato into the ice bath.

CURE

1. After the gelato has cooled, remove from the ice bath and refrigerate for 4-12 hours.

PROCESS

1. Give the gelato a quick stir with an immersion blender or whisk then process in an ice-cream maker according to the manufacturer’s instructions.   Just before the gelato is ready, add in the bits of candied orange (if using)
2. The gelato is finished when it reaches the consistency of soft-serve ice cream (about 20-30 minutes on most machines) Scoop into a container, place a piece of plastic wrap or parchment paper on the surface and freeze until firm (4 hours minimum)