- Line an 18X28cm rectangular slice tin with baking paper. Set aside. 
- To make the chocolate layer, place dark chocolate melts into the Thermomix bowl and grate for 10 seconds, Speed 9. Set aside in a seperate bowl. 
- Add the raw sugar to the Thermomix bowl and mill for 10 seconds, Speed 9. 
- Add the sweetened condensed milk, butter and liquid glucose to the bowl with the sugar. Cook for 8 minutes, 100 degrees, Speed 3 (MC off). Scrape down the sides of the bowl. 
- Cook for 20 minutes, Varoma temperature, Speed 3 (MC off). Scrape down the sides of the bowl. 
- Add grated dark chocolate and mix for 30 seconds, Speed 3. 
- Working quickly, spread the chocolate fudge into the prepared tray. 
- Sprinkle over the crushed Peppermint Crisp bars and chill in the fridge while you prepare the mint fudge layer. 
- To make the mint layer, place white chocolate melts into the Thermomix bowl and grate for 10 seconds, Speed 9. Set aside in a seperate bowl. 
- Add the raw sugar to the Thermomix bowl and mill for 10 seconds, Speed 9. 
- Add the sweetened condensed milk, butter, liquid glucose, peppermint essence  and green food colouring (optional) to the Thermomix bowl. Cook for 8 minutes, 100 degrees, Speed 3 (MC off). Scrape down the sides of the bowl. 
- Cook for 20 minutes, Varoma temperature, Speed 3 (MC off). Scrape down the sides of the bowl. 
- Add milled chocolate and mix for 30 seconds, Speed 3. 
- Working quickly, spread the mint fudge over the chocolate fudge layer and place back into the fridge to set.