Step 1

Line the base and the sides of an 18 x 28cm slice tin with baking paper, making sure you leave plenty hanging over the sides.

Step 2

Chop the butter and place it into the Thermomix bowl. Melt for 3 minutes, 80 degrees, Speed 2 (or until melted).

Step 3

Add the biscuits and crush for 10 seconds, Speed Scrape down the sides of the bowl and repeat for a further 5 seconds.

Step 4

Remove the biscuit mixture from the bowl and pour into the lined tray. Push the mixture down with the back of a metal spoon to create a flat surface.Place in the fridge while you prepare the filling.

Step 5

To make the filling, combine the gelatine in a jug with the boiling water and allow to cool slightly.

Step 6

In a clean Thermomix bowl, add the lemon juice and sweetened condensed milk and mix for 45 seconds, Speed 3, with the measuring cup off. While the blades are turning, slowly pour the gelatine mixture into the bowl through the MC hole and mix until combined.

Step 7

Remove the slice base from the fridge and pour over the filling. Place back into the fridge to set.

Step 8

In a clean Thermomix bowl, add the hot water and heat for 3 minutes, 90 degrees, Speed 2.

Step 9

Add the jelly crystals and gelatine and mix on Speed 2 until they have dissolved. Pour the jelly into a seperate bowl and allow it to cool to room temperature.

Step 10

Remove the slice from the fridge and carefully pour the jelly over the top. Place it back in the fridge to set for approximately 4 hours (overnight is best).