Grease and line a 18X28cm rectangular slice tray with baking paper and set aside.
Place the roasted almonds into the Thermomix bowl and press Turbo 2-3 times (or until the almonds are roughly chopped - it's fine if there's still a few whole almonds). Set aside in a large bowl.
Add the pitted dates to the Thermomix bowl and hold down Turbo for 5-10 seconds or until roughly chopped. Add to the bowl with the chopped almonds.
Place the plain biscuits into the Thermomix bowl and finely crush on Turbo for 10-15 seconds. Add to the almonds and dates and set aside.
Place the condensed milk, golden syrup and butter into the Thermomix bowl and melt on 80 degrees, 3 minutes, Speed 2. Scrape down the sides of the bowl and repeat for a further 1 minute, 80 degrees, Speed 2.
Add the crushed biscuits, chopped almonds and dates and mix on Reverse Speed 3 for 10 seconds or until completely combined.
Spoon into the prepared tray and smooth down the top with a spoon.
Place into the fridge for 1 hour.
Grate the chocolate by pressing Turbo 3-4 times. Add the coconut oil and melt on 80 degrees, 3 mins, Speed 2 (scrape down the bowl partway through).
Pour the chocolate over the top of the slice and allow to set before cutting into slices.