Thermomix Lemon Delicious Slice

Published , Last Updated

Lemon delicious slice is a zingy curd-like custard slice on a baked, buttery biscuit base. This is a simple Thermomix lemon slice recipe that the whole family will love!

Square image of lemon slice with a flower vase behind on white backgraound

This is one of my favourite retro treats! I have a weak spot for all lemon desserts actually.  I used to make this recipe in my food processor as it was much easier than making it by hand. Now that I have a Thermomix I no longer own a food processor and happily this slice even easier to make in the Thermomix.

Gluten-Free Lemon Delicious Slice

I have a friend who highly sensitive to gluten and is on a strictly Gluten-free diet.  He has a sweet tooth so I wanted to make a dessert that was safe for him to eat and super delicious! I trialled this recipe substituting White Wings Gluten-free flour with the regular flour.  The recipe was a straight swap between the flours and turned out perfectly. I couldn’t find any taste or texture difference between the two slices. 

Step By Step Lemon Slice

3 Images showing the stages of making the Lemon delicious slice

Two images showing the ingredients and filling for the lemon slice

If you’re looking for more desserts take a look at some of my favourites!


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Overhead image Thermomix lemon slice

Lemon Delicious Thermomix Slice
Prep Time
10 mins
Cook Time
45 mins
Resting time
30 mins
Total Time
1 hr 25 mins

Lemon Delicious Slice is a zingy curd-like custard slice on a baked, buttery biscuit base. This is a simple Thermomix lemon slice recipe that the whole family will love! #Thermomix #dessert #Lemon #lemonslice

Course: Dessert, Snack
Cuisine: Australian
Keyword: Dessert, Lemon, Lemon Bar, Lemon Slice, Lunchbox, slice, Thermomix Slice
Servings: 28 slices
Calories: 165 kcal
Author: Julie Carlyle
  • 185 g sugar
  • 160 g butter cubed
  • 250 g plain flour  *sub for GF Flour in necessary
Curd Filling
  • 275 g sugar
  • 55 g cornflour *check GF if required
  • 4 eggs
  • 160 g lemon juice 3-4 lemons depending on size and juice
  1. Line a baking tray with paper and preheat the oven to 170 degrees fan-forced.

  2. Place the sugar in TM Bowl. Mill 10 sec/Speed 9.

  3. Add the butter to the sugar. Heat 2 min/100 degrees/Speed 2.

  4. Add flour to TM bowl. Process 10 Sec/Speed 5.

  5. Scrape down bowl. Repeat 10 Sec/Speed 5.

  6. Transfer the biscuit base into prepared tray. Press the crumb down until smooth.

  7. Bake 15-20 minutes or until golden.

  8. Allow the slice to cool slightly before starting to prepare the filling! (30 minutes out of the oven)

Lemon Curd Filling (Without cleaning the bowl!)
  1. Add sugar to TM bowl. Mill 10 Sec/Speed 9.

  2. Add remaining ingredients to TM Bowl. Combine 15 sec/ Speed 5.

  3. Pour the filling over the biscuit base and return the slice to the oven

  4. Cook for 30 minutes or until the slice is cooked but still has a wobble.

  5. Refrigerated the slice once cooked.

Recipe Notes

The slice will set further once refrigerated.

To ensure the slice is GF make sure only pure milled sugar is used to dust the slice.

Nutrition Facts
Lemon Delicious Thermomix Slice
Amount Per Serving
Calories 165 Calories from Fat 54
% Daily Value*
Fat 6g9%
Saturated Fat 4g20%
Cholesterol 39mg13%
Sodium 61mg3%
Potassium 26mg1%
Carbohydrates 25g8%
Fiber 1g4%
Sugar 17g19%
Protein 2g4%
Vitamin A 212IU4%
Vitamin C 2mg2%
Calcium 7mg1%
Iron 1mg6%
* Percent Daily Values are based on a 2000 calorie diet.

Please feel free to leave me a comment. I love hearing from everyone 🙂Rating the recipe once you’ve made the dish helps other readers decide whether to make my dishes, so I would love it if you could come back and let everyone know what you think.

Landscape image of lemon slice cut into bars on a cooling rack.

Happy Cooking


6 thoughts on “Thermomix Lemon Delicious Slice”

  1. Dawn watt says:

    Yum cooking this week

    1. I hope you like it 🙂

  2. Nicole Keeley says:

    Hi Julie, I love your stuff and would like to do this for a bake sale instead of the standard and very sweet lemon coconut slice. Wondering how it would go out of fridge in Victoria atm? Fete goes from 4-8pm. Thanks

    1. Hi Nicole
      Thank you so much for your lovely comment. I don’t think this recipe would be suitable for a bake sales when the slice warms up it becomes more delicate.
      Sorry Julie

  3. Deanne Cumming says:

    Can this be frozen afterward?

    1. Hi Deanne
      I have never tried freezing the slice but I can’t see why it would be a problem.

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