Melt half of your milk chocolate in a double boiler or microwave-safe bowl. Tip: If you want to achieve a hard clean snap when the chocolate sets, temper your chocolate by not letting it go past 90 degrees Fº. Check the temperature with an instant-read thermometer.
Once the chocolate is melted, pour it into your chocolate bar molds and let the excess drip off into a bowl. (you can re-melt the chocolate drippings for the top layer).
Now place that chocolate filled mold in the fridge to harden.
In the meantime, make the filling. Chop up the shredded phyllo dough and place it in a pan with the melted butter over medium heat. Stir until the shredded phyllo is golden and crispy. Note: if you use kataifi that is already shredded, there is no need to chop it.
Place the crispy phyllo shreds into a large bowl and mix it with the tahini and pistachio cream.
Once the chocolate firmed up, remove it from the fridge and spread a layer of the pistachio filling on top. Leave a little border empty on the edges so that it won’t ooze out later.
Now melt the remaining half of your milk chocolate and pour it on top. Give it a good shake to smooth it out with an offset spatula. Then scrape off the extra with a bench scraper and let it set in the fridge for about an hour or until fully set and hard.
Notes
Check the temp with a thermometer- If you're tempering the chocolate, then make sure to check the temperature with an instant-read thermometer.
Remelt the chocolate- You can re-melt the chocolate drippings from the top layer for the bottom layer.
Leave a border around the filling- Leave a little border empty on the edges so that the filling won’t ooze out later.
Smooth out the bottom- Use a spatula and scraper to smooth out the bottom and get off any excess chocolate for a clean look.
Use a food processor- chopping the chocolate with a food processor will speed up the process.