This perfectly zesty and delicious Lemon Slice Recipe had been hiding in the Cooking with Nana Ling collection for too many years.
Here it is... at last! And it's been an instant hit. Deee-licious.
While there are a few variations on the Lemon Slice Recipe, this old-fashioned recipe which packs in the juice of two lemons and zest from one, is my pick by a long shot.
Indeed, I searched all the way back to the 1960s to find my favourite version of this popular slice.
The original recipe comes from a 1960 recipe competition, and the person who sent in the recipe sums up the slice well: "This slice is really delicious and also keeps well." Tick. Tick.
Three lovely lemon-y layers
This Lemon Slice is made up three layers which, combined, make this an absolutely more-ish treat.
To get started on the recipe, you'll need a standard slice tin of about 28 x 18 cm.
Grease the tin and then line with baking paper, leaving the paper overhanging on each side to assist with removing the slice from the tin once it's ready to slice up.
The recipe instructions are all included in the recipe card at the bottom of this post. However, I'm also going to outline the process, and highlight a few things, here.
1. The biscuit layer
The bottom biscuit layer is made by creaming butter and sugar and then adding an egg, SR flour and the zest from one lemon.
Once combined, the mixture is pressed into the tin using your fingers. It might be a little sticky and difficult to work with, but that can be solved by dusting your hands and the top of the slice with a little extra flour.
To get a nicely even and flat layer, you can also use the back of a metal spoon or a small glass cup when pressing the mixture into the tin.
Next, you'll need to bake off the biscuit layer and let it cool.
2. The lemon filling
You can start making this layer as soon as you pop the biscuit base into the oven as it will also need to cool before you can spread it over the cooled first layer.
The lemon filling is made by combining sugar, water and lemon juice in a saucepan over heat and then thickening with cornflour.
It's easy peasy to make up, you just need to make sure it's cooled to a lukewarm temperature before spreading it over the completely cooled biscuit base.
Once you've added this layer, pop the slice into the fridge while you make up the topping.
3. The cream topping
The cream layer really is the icing on the cake here. It's subtle sweetness and velvety texture is perfect against the zesty biscuit and filling layers.
You make this cream by heating milk and then thickening with cornflour. You then whisk in butter and icing sugar.
Once cooled, whisk the mixture again and spread it over the slice.
If you're a coconut-lover, sprinkle with a little shredded coconut.
Now, it's back into the fridge for at least a few hours to set. Then, slice it up and enjoy!
Enjoying your Old-fashioned Lemon Slice
This slice is best stored in the fridge and should keep for up to five days.
I don't recommend freezing this slice.
Just make it up fresh, share it around, then sit down and wash it down with your favourite hot drink.
And if you've still got lemons to use up, you might like to add these recipes to your "must try" list too:
The original Lemon Slice Recipes
I found this recipe in a newspaper clipping dated 1960 (The Australian Woman's Mirror, from Nana Ling's clipping collection) and again (almost identical) in The Red Cross Tried & True Cookery Book dated 1983.
I have tweaked it just a little, and added further instructions, so please continue scrolling to find the updated recipe card below.
Lemon Slice
Equipment
- Slice tin (approx 28 x 18cm)
Ingredients
Base
- 120 grams butter
- ½ cup caster sugar (110 grams)
- 1 egg
- 1 ½ cups SR flour
- zest from one lemon
Lemon Filling
- ½ cup caster sugar
- 1 cup water
- ½ cup lemon juice (approx juice from 2 lemons)
- 3 tablespoons cornflour
- 2 tablespoons water (for blending with cornflour)
Cream Topping
- 1 ½ cups full cream milk
- 2 tablespoons cornflour
- 1 tablespoon milk (for blending with cornflour)
- 20 grams butter (cut into cubes)
- ½ cup icing sugar
- 2 tablespoons shredded coconut (optional)
Instructions
Base
- Grease the slice tin (approx 28 x 18cm) and line with baking paper, leaving paper overhanging at sides to assist with removal of slice later.
- Pre-heat oven to moderate (170-180 degrees celsius, fan-forced).
- Cream butter and sugar.
- Add egg and beat again for a minute or two until completely combined.
- Add sifted flour and zest and mix until combined.
- Press mixture into tin. Flour your hands if mixture is too sticky to work with.
- Use the back of a metal spoon and a small glass jar to assist in evening out the mixture to form an even, flat surface.
- Bake for 17-20 minutes or until lightly browned.
- Allow to cool in tin.
Lemon Filling
- Heat sugar, water and lemon juice in a saucepan and bring to the boil.
- Combine cornflour with the 2 tablespoons water and blend to a paste. Add to saucepan and continue to boil rapidly, stirring from time to time, for 10 minutes or until mixture thickens.
- Allow to cool to a lukewarm temperature and then spread over cooled biscuit base.
- Place in fridge while you make up the top cream layer.
Cream Topping
- Heat milk in a saucepan until bubbles begin to form around edges of saucepan.
- Combine cornflour with the tablespoon of milk and blend to a paste. Add to saucepan and whisk over heat until mixture thickens. Remove from heat and add butter and icing sugar. Stir until combined.
- Allow mixture to cool completely.
- Whisk mixture and then spread over lemon filling layer.
- Sprinkle shredded coconut over top of slice if desired.
- Place in fridge for at least a few hours to set.
- Remove slice from tin using overhanging paper and slice into squares.
- Store slice in the fridge.
Kay Louise
This slice tasted delicious, but the top didn't set. It only firmed a little and we ended up having to eat it more like a dessert in a bowl. Not sure what I did wrong.
Libby Hakim
Hi Kay. That's a shame the top didn't set but at least you could still enjoy it. Did you cook it enough once you added the cornflour? And cooled completely before whisking? And is your cornflour fresh? If this is all ok, perhaps just try adding a little extra cornflour next time. Libby x
Amanda
Thank you! My family has been searching for this recipe for years. My Grandma used to make it all the time, it was family favourite. I am going to attempt to veganise it. 🙂
Libby Hakim
Wonderful! It is an amazing slice. Good luck with making it vegan - happy cooking 🙂
Jasmin
I think this is the lemon slice my grandma used to make. Thank you for sharing the recipe, I’ve been looking for it for a long time x
Libby
Hi Jasmin - oh, lovely! Hope it's the one. We loved it and I've had lots of great feedback. Happy cooking x
kim farrell
Hello makes my mouth tingle reading the recipe BUT could I do it also with limes
Libby
Hi Kim. I haven't tested it with limes but I can't see why it wouldn't work. Let me know how you go 🙂
Carol
Made this gorgeous slice 2 day luv luv luv it was going to take some 2 the neighbours but was 2 good 2 share
Libby
Hi Carol. lol - the neighbours miss out on this one! Totally agree. This is one of my favourite finds so far. thanks so much for your feedback. Libby 🙂