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The best jelly Slice recipe
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3.74 from 67 votes

The BEST Jelly Slice Recipe

This really is the best Jelly Slice recipe you will ever make - I promise! Both regular and Thermomix instructions are included.
Prep Time1 hr
Total Time1 hr
Course: Slices
Servings: 24
Author: Lauren


  • 250 g of Marie biscuits - or any other plain biscuit
  • 180 g of melted butter
  • 395 g can of condensed milk
  • 2 1/2 teaspoons of gelatine
  • 3/4 cup of boiling water
  • 2 Lemons – juiced
  • 1 packet to strawberry jelly
  • Boiling Water as per jelly packet instructions
  • An extra 1 teaspoon of gelatine – for the jelly top


  • Line the base and the sides of a slice tin with baking paper, making sure you leave plenty hanging over the sides.
  • Crush the biscuits until they resemble fine breadcrumbs. You can use a rolling pin or food processor.
  • Add the melted butter to the crushed biscuits and mix until combined. Pour the mixture into the lined slice tine and press down with the back of a metal spoon and place in the fridge to chill.
  • In the meantime, add 2 1/12 teaspoons of gelatine to 3/4 of a cup of boiling water and stir until it has dissolved. Place the condensed milk into a bowl and while whisking, add the dissolved gelatine mixture and the lemon juice. Continue to whisk until mixture is smooth and has combined.
  • Remove the set biscuit base from the fridge and pour over the condensed milk layer. Place back in the fridge, until it just begins to start to set – approximately 30 - 45 minutes
  • While the slice is chilling, you can make the strawberry jelly as per the packet instructions – adding an extra teaspoon of gelatine. Allow the jelly to cool until it has reached room temperature.
  • Remove the slice from the fridge and carefully pour the jelly over the slice and place it back in the fridge to completely set approximately 6 hours – overnight is best.
  • Remove the set slice from the fridge and using a hot knife, cut into squares.


If it's possible, leave this slice to set overnight before cutting.
Use a sharp knife to help cut through the layers easily.