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Zesty Lemon Slice

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This is the sort of slice you make when you want something bright, tangy, and utterly satisfying. With a tender base and creamy lemon icing, it's a crowd-pleaser that happens to be gluten-free. Simple to make and even simpler to enjoy.
Shilpa | WEATZERO® | September 2025
Prep Time 15 minutes
Cook Time 25 minutes
Hold Time 10 minutes
Total Time 50 minutes
Servings: 16 pieces
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Notes

From Experience: Wins, Fails, and What Stuck

Weigh Your Flour. Always use kitchen scales. WEATZERO® is crafted for 1:1 gram-for-gram swaps—cups simply aren't accurate enough for gluten-free blends.
Don't overmix after adding the flour, gentle mixing keeps it light and soft.
Hold the mixture as instructed - this aids the Gluten Free Millet Flour to hydrate and improves texture significantly.
Cool completely before icing - warm slice will melt your beautiful lemon icing and create a mess rather than the clean finish you're after.
Zest first, juice second - always zest your lemon before juicing it. Much easier to handle!

Ingredients
 

Dry Blend
Base
  • ½ cup (115g) Butter unsalted - Room Temperature
  • ¾ cup (150g) Caster Sugar
  • 1 large Lemon zest - use a microplane or box grater
  • ¼ cup Juice from Large Lemon - use the lemon after zesting for juice
  • 2 Large Eggs - Room Temperature
Lemon Icing
  • cups (270g) Pure Icing Sugar - Sifted
  • ¼ cup (65 g) Butter unsalted - Room Temperature
  • 4 tbsp Fresh Lemon Juice
  • 1 tbsp Lemon Zest
Equipment Zesty Lemon Slice

Method
 

Prepration
  1. Preheat oven to 180°C (356°F) conventional or 170°C (338°F) fan-forced
  2. Grease and line a 20cm (8-inch) square cake tin with baking paper, leaving overhang for easy removal.
Make the base
  1. Using an electric mixer (hand mixer or stand mixer), beat butter, caster sugar, and lemon zest in a large bowl on medium-high speed for 4-5 minutes until light, fluffy, and pale in colour.
  2. Add eggs gradually. Add first egg and beat on medium speed for 1 minute until fully incorporated. Add second egg and beat for another minute until well combined.
  3. Add lemon juice. Pour in lemon juice and beat on low speed for 30 seconds until just mixed (mixture may look slightly curdled - this is normal).
  4. Fold in dry ingredients. Using a rubber spatula, gently fold in baking powder and WEATZERO® flour. Fold just until combined - don't overmix at this stage.
Hold
  1. Let mixture stand for 10 minutes (essential for best texture).
Trasfer and Bake
  1. Spoon mixture into prepared tin and gently smooth the top with the back of a spoon.
  2. Bake for 20 minutes or until golden and a skewer inserted in centre comes out clean.
  3. Cool completely in tin before icing.
Make the Icing
  1. Using an electric mixer, place butter in a medium bowl. Add icing sugar gradually in small batches to prevent dust clouds. Start beating on low speed initially to prevent sugar flying everywhere, then increase to medium-high speed.
    Add lemon juice and beat for 2-3 minutes until smooth and creamy.
  2. Adjust consistency with extra lemon juice (to thin) or icing sugar (to thicken) as needed.
  3. Using a palette knife or offset spatula, spread evenly over cooled slice or pipe decorative lines if you're feeling fancy.
  4. Sprinkle the lemon zest on top evenly.
  5. Let icing set for 30 minutes before cutting into squares. Use a sharp knife wiped clean between cuts for neat squares.
Serving Suggestions
  1. Perfect with afternoon tea or coffee. Serve chilled on warm days for an extra refreshing treat. Beautiful alongside fresh berries or a dollop of Greek yoghurt.
    Close-up of gluten-free lemon slice made with WEATZERO flour
Storage
  1. Store covered in the refrigerator for up to 5 days. The slice actually improves after a day as the flavours develop.
    Can be frozen (without icing) for up to 3 months - thaw completely and add fresh icing before serving.

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