Step 1

Lightly grease the base and sides of a 20cm square cake tin.

Step 2

Place 9 of the lattice biscuits in a 3X3 grid on the base of the tin (they should fit almost perfectly). Set aside.

Step 3

Place the custard powder into a saucepan with 1/4 cup of the milk. Stir until all of the custard powder has dissolved. Add the remaining 2 1/4 cups of milk and the caster sugar.

Step 4

Whisking continuously, heat the custard over a medium heat for 5 minutes or until it has started to thicken. Once the custard starts to boil, continue whisking for a further 2 minutes or until very thick. Place a sheet of glad wrap over the custard to stop it forming a 'skin' and allow to cool for 20 minutes.

Step 5

Pour/spread the cooled custard over the biscuits and top with another 9 biscuits in the same 3x3 grid.

Step 6

To make the icing, sift the icing sugar into a bowl and add the food colouring.

Step 7

Add the water 1 tablespoon at a time and stir until you have a smooth paste (that can be spread).

Step 8

Spread the icing over the slice and place into the fridge for 3-4 hours (overnight is best).

Step 9

Cut the slice into 9 pieces using the shape of the biscuits to guide you.

Step 10

Lightly grease the base and sides of a 20cm square cake tin.

Step 11

Place 9 of the lattice biscuits in a 3X3 grid on the base of the tin (they should fit almost perfectly). Set aside.

Step 12

Place the custard powder, milk and caster sugar into the Thermomix bowl. Cook for 9 minutes, 90 degrees, Speed If the custard is too runny, cook for a further minute.

Step 13

Place a sheet of glad wrap over the custard to stop it forming a 'skin' and allow to cool for 20 minutes.

Step 14

Pour/spread the cooled custard over the biscuits and top with another 9 biscuits in the same 3x3 grid.

Step 15

To make the icing, place the icing sugar into a clean and dry Thermomix bowl. Sift by pressing Turbo for 2-3 seconds. Add the pink food colouring and 3 tbs water. Mix for 10 seconds, Speed Scrape down the sides of the bowl and mix for a further 5 seconds. If the mixture is too thick and can't be spread, add 1 more tablespoon and mix again (it should be a thick paste).

Step 16

Spread the icing over the slice and place into the fridge for 3-4 hours (overnight is best).

Step 17

Cut the slice into 9 pieces using the shape of the biscuits to guide you.