Lemon Slice Icing
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This Lemon Slice Icing Recipe is the perfect finishing touch for both cooked and no-bake lemon slice recipes. With its vibrant lemon flavor and lush consistency, it adds a delightful citrusy punch to any slice!

Lemon Slice Icing Recipe
Preparing this lemon slice icing is a breeze. Just a few simple ingredients whisked together create a smooth, creamy topping that spreads easily over any slice.
Whether you’re dressing up baked dessert bars or adding a tangy lemon finish to a no-bake slice, this icing complements any base.
Best Lemon Slice Recipes
- Gluten-Free Lemon Slice – Enjoy a zesty, refreshing treat with this gluten-free lemon slice, perfect for a sweet, tangy snack!
- Vegan Gluten-Free Lemon Slice – Experience a burst of lemon in this tangy, sweet slice made with vegan, gluten-free ingredients!
- Lemon Oat Coconut Slice – The delightful combination of lemon, oats, and coconut in this slice offers a perfect balance of tartness and sweetness!
- Lemon Slice Without Condensed Milk – The pure, bright lemon flavor in this slice is made without condensed milk, keeping it lighter and just as delicious!
- Baked Lemon Slice – Indulge in this baked lemon slice, where the flavors intensify in the oven, resulting in a deeply flavorful and satisfying dessert!

Essential Ingredients
The essential ingredients listed below are affiliate links on Amazon so you can easily find and see the exact products I recommend for creating this lemon slice icing!
Must Have Tools
For making this recipe, it’s essential to have these Amazon affiliate tools at your disposal.

Can I use bottled lemon juice instead of fresh?
While fresh lemon juice is recommended for its fresh flavor and lack of preservatives, bottled lemon juice can be used in a pinch. Note that the flavor might not be as vibrant.
Can lemon slice icing be used on any dessert base?
Absolutely! This lemon slice icing is incredibly versatile and can be used on a variety of dessert bases. Its creamy texture and robust flavor make it an excellent choice for any slice base.
Expert Tips
- Measure your baking ingredients accurately: Check out my helpful guide on how to measure basic ingredients.
- Achieve Perfect Consistency: If your icing is too thick to spread, add a little more lemon juice, one teaspoon at a time, until it reaches a smooth, spreadable consistency. Conversely, if it’s too runny, gradually mix in more powdered sugar until thickened.
- Enhance the Flavor: For an extra zesty kick, include a bit of lemon zest into the icing. This not only boosts the lemon flavor but also adds a fresh, aromatic touch.
- Smooth Application: Use a warm, dry spatula to spread the icing. Warming the spatula under hot water and drying it off can help achieve a smoother finish without sticking.

How to store lemon slice icing
While lemon slice icing is best used fresh, you can manage leftovers or prepare it in advance with these storage guidelines:
Store: If you have leftover icing or need to make it ahead, keep it in an airtight container in the refrigerator for up to 3 days. Before reuse, let it warm to room temperature for about 30 minutes and give it a good stir. If it appears thick or separated, add a little more lemon juice and whisk until it regains a smooth consistency.
Freeze: Freezing is not recommended as it can alter the texture of the icing, causing separation or graininess. If you must freeze, use an airtight container and store for no more than 1 month.
Thaw: Thaw frozen icing in the refrigerator overnight. Stir well after thawing, and add a bit of lemon juice if needed to smooth it out. Use the revived icing promptly for best results.
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Lemon Slice Icing
Ingredients
Method
- Prepare Base: Ensure your slice base (whether cooked or no-bake) is ready and set before you begin making the icing to prevent it from hardening too quickly.
- Sift Sugar: In a medium-sized mixing bowl, sift the powdered sugar to remove any lumps.
- Combine Ingredients: Pour in the melted butter and lemon juice. Whisk the mixture until well combined and smooth; the texture should be thick.
- Spread Icing: Spread the icing over your prepared slice base immediately to ensure it smooths out easily. Use a spatula or the back of a spoon for an even layer.
- Chill and Set: Allow the iced slice to set in the refrigerator for about 1-2 hours.
- Serve: Once set, cut into desired pieces and serve. Enjoy!
Nutrition
Notes
- Store: If you have leftover icing or need to make it ahead, keep it in an airtight container in the refrigerator for up to 3 days. Before reuse, let it warm to room temperature for about 30 minutes and give it a good stir. If it appears thick or separated, add a little more lemon juice and whisk until it regains a smooth consistency.
- Freeze: Freezing is not recommended as it can alter the texture of the icing, causing separation or graininess. If you must freeze, use an airtight container and store for no more than 1 month.
- Thaw: Thaw frozen icing in the refrigerator overnight. Stir well after thawing, and add a bit of lemon juice if needed to smooth it out. Use the revived icing promptly for best results.
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