If you’ve ever grabbed a lemon slice from a bakery in Australia, you already know the magic: a buttery biscuit base, a bright lemon-coconut topping, and the satisfying snap of a perfectly set bar. This guide covers both the classic no-bake version that rules Down Under and the baked lemon bar that’s the American standard, so you can make either—or both—with confidence.
Prep time: 15 minutes · Cook/Set time: 20 minutes (baked) or 2 hours (no-bake) · Total time: 35 min to 2 hr 15 min · Servings: 16 slices · Calories per slice: 180–220
Quick snapshot
- No‑bake lemon slice relies on sweetened condensed milk to set Sweetest Menu (Australian recipe blog)
- Baked lemon slice uses a shortbread base The Links Site (baking resource)
- Lemon juice curdles condensed milk naturally without heat Chef Not Required (food blog)
- Origin of the name “lemon slice” vs “lemon bar” is not definitively documented
- Best biscuit for the base varies by region and personal preference
- Ideal set time can range from 1 hour to overnight depending on temperature and pan depth
- Base chill: at least 1 hour (Sweetest Menu) to 4 hours (Annie’s Noms) Annie’s Noms (baking blog)
- Frosting set: 1 additional hour minimum Sweetest Menu (Australian recipe blog)
- Longer chill = easier to cut cleanly The Links Site (baking resource)
- Try the no‑bake method for a quick, oven‑free dessert
- For a firmer, golden‑topped slice, bake the shortbread‑curd version
- Experiment with gluten‑free biscuits or dairy‑free condensed milk alternatives
These recipes share a core architecture—butter, biscuit, lemon, and sweetener—in two distinct traditions. Here’s how the numbers compare.
| Detail | Value |
|---|---|
| Prep time | 15 minutes |
| Cook / Set time | 20 minutes (baked) or 2 hours (no‑bake) |
| Total time | 35 min to 2 hr 15 min |
| Servings | 16 slices |
| Calories per slice | 180–220 |
| Storage (fridge) | 5–7 days |
| Freezer | up to 3 months |
What is a lemon slice?
Lemon slice is a dessert bar that sits squarely in the Australian, New Zealand, and British baking repertoire. It’s typically made from crushed sweet biscuits, melted butter, sweetened condensed milk, lemon juice, and desiccated coconut, then chilled without baking. The baked version—often called “lemon bars” in North America—uses a shortbread crust and a baked lemon curd filling.
No‑bake slices trade oven heat for patience: the set depends entirely on the chemical reaction between lemon acid and condensed milk, which firms up over hours. Bakeries rely on the baked variety for speed and a shelf‑stable crumb (Sweetest Menu, Australian recipe blog).
Why is it called a slice?
- The term “slice” is common in Australia and New Zealand for any tray‑baked bar that is sliced into portions after setting.
- Unlike cakes or biscuits, slices are defined by their layered structure: a base, a filling, and sometimes a topping.
- In the UK, the same dessert is sometimes called “lemon shortbread” or “lemon melt.”
The implication: while names vary by hemisphere, the technique of pressing and chilling binds them all.
How does it differ from lemon bars?
- Lemon bars (the American standard) always have a baked shortbread crust and a baked lemon curd layer.
- Lemon slice typically skips the oven and relies on condensed‑milk setting.
- Texture: slice is softer, often with visible coconut; bars have a firmer, fudge‑like curd.
Why this matters: choosing between the two determines your equipment needs (oven vs fridge) and how far ahead you can prepare.
What ingredients are in a lemon coconut slice?
The classic no‑bake lemon coconut slice uses a short list of supermarket staples. Here are the exact proportions from two trusted recipes, side by side.
| Ingredient | Sweetest Menu (8×8 pan) | Chef Not Required (20 cm pan) |
|---|---|---|
| Plain sweet biscuits | 300 g | 250 g |
| Desiccated coconut | 100 g | 85 g |
| Lemon zest | zest of 2 lemons | zest of 1 lemon |
| Unsalted butter (melted) | 60 g | 100 g (salted) |
| Sweetened condensed milk | 240 ml | 250 g |
| Fresh lemon juice | 2–3 tablespoons | juice of 1 lemon |
Seven ingredients, one pattern: the condensed milk does double duty as sweetener and binder. Without it, the slice won’t hold (Chef Not Required, food blog).
Can I use desiccated coconut?
- Yes—desiccated coconut is the standard. It’s finely shredded and unsweetened, which absorbs moisture without clumping.
- Avoid shredded coconut (too long and chewy) unless you’re after a different texture.
- For a stronger coconut flavour, toast the desiccated coconut lightly before mixing.
What biscuits work best for the base?
- Australia: Arnott’s Marie or Nice biscuits are the default (Annie’s Noms, baking blog).
- UK / Canada: Digestive biscuits or graham crackers make an easy swap.
- Plain shortbread cookies also work, but reduce the butter slightly to avoid a greasy base.
Can I substitute sweetened condensed milk?
- Not easily—its sugar‑density and viscosity are essential for setting. Low‑fat or evaporated milk won’t firm up.
- Dairy‑free: use a can of coconut sweetened condensed milk (available in major supermarkets).
Substituting the condensed milk is the single biggest risk factor in this recipe. The slice will stay soft and refuse to cut cleanly without the concentrated sugar‑protein matrix (Sweetest Menu, Australian recipe blog).
The implication: the condensed milk is the structural backbone of the no-bake slice.
How do you make a no‑bake lemon slice?
Four straightforward steps, each with a critical timing detail. The entire process fits in a 20 cm (8×8) pan.
Step 1: Prepare the base
- Crush 250–300 g plain sweet biscuits into fine crumbs. Use a food processor or a sealed bag and rolling pin.
- Melt 60–100 g butter and combine with biscuit crumbs until the mixture holds together when pinched.
- Press firmly into a lined 20 cm square pan. Use the bottom of a glass to compact evenly.
Step 2: Press and chill
- Place the pan in the fridge and chill for 1 hour (minimum) to 4 hours (best results) (Annie’s Noms, baking blog).
- The base should feel firm to the touch before adding the topping.
Step 3: Make the lemon topping
- Mix 300–400 g sweetened condensed milk with the juice and zest of 1–2 lemons, 85–100 g desiccated coconut, and a pinch of salt.
- Stir until the mixture thickens slightly (the lemon acid will start curdling the milk).
- Spread evenly over the chilled base.
Step 4: Set and slice
- Return the pan to the fridge for at least 2 hours, preferably 4 hours or overnight (The Links Site, baking resource).
- For clean cuts, use a sharp knife wiped between slices. Chill 30 minutes after cutting if the edges soften.
The pattern: patience pays off. A longer chill (4+ hours) turns the slice from soft‑set to bakery‑firm.
How do you make a baked lemon slice?
For fans of the American lemon bar tradition, the baked method delivers a sturdy base and a glossy, tart top.
What is the shortbread base recipe?
- Preheat oven to 180 °C (350 °F).
- Cream 115 g softened butter with 50 g sugar. Mix in 150 g all‑purpose flour and a pinch of salt.
- Press the dough into a lined 20 cm square pan and bake for 15 minutes until lightly golden.
How do you make lemon curd topping?
- Whisk 3 large eggs, 200 g sugar, 80 ml lemon juice, and 2 tablespoons flour until smooth.
- Pour over the hot shortbread base and bake for another 18–20 minutes until the top is set and the centre jiggles slightly.
- Cool completely before slicing. A dusting of icing sugar finishes it.
The catch: the baked version can’t be rushed—the curd needs gradual heat to avoid curdling. But it holds shape at room temperature, unlike the no‑bake version (The Links Site, baking resource).
How long does lemon slice last and can you freeze it?
Both versions store well, but the no‑bake slice is more forgiving in the fridge.
Storing in the fridge
- No‑bake lemon slice: keeps 5–7 days in an airtight container. The moisture from the coconut actually improves over the first two days.
- Baked lemon slice: 3–5 days. The shortbread can soften after day four.
Freezing lemon slice
- Both varieties freeze well for up to 3 months.
- Slice first, then wrap each piece individually in plastic and foil. Thaw in the fridge overnight.
- Baked slices should be frozen without the icing sugar dusting to avoid condensation spots.
What this means: if you’re prepping for a party, make the no‑bake version up to a week ahead; for longer term storage, freeze the baked bars.
Confirmed facts
- No‑bake lemon slice requires sweetened condensed milk to set. Sweetest Menu (Australian recipe blog)
- Lemon juice curdles the condensed milk naturally without heat. Chef Not Required (food blog)
- Baked lemon slice uses a shortbread base. The Links Site (baking resource)
What’s unclear
- Origin of the name “lemon slice” vs “lemon bar” is not definitively documented.
- Best biscuit for base varies by region and personal preference.
- Exact set time depends on ambient temperature and pan material; no single rule covers all fridges.
“Lemon bars are tart and not‑too‑sweet. The shortbread crust keeps them from being cloying.”
— Nagi Maehashi, RecipeTin Eats (trusted recipe developer)
“My lemon coconut slice is a no‑bake favourite because it’s so simple—crush, mix, chill. You don’t even need to turn on the oven.”
Whether you reach for the fridge or the oven, the choice between no‑bake and baked comes down to time, texture, and your tolerance for heat. For Australian bakers, the no‑bake slice wins on convenience and that soft, coconut‑studded crumb. For American cooks, the baked lemon bar offers a reliable, slice‑and‑serve option that doesn’t require fridge space. Either way, the core principle holds: lemon and condensed milk (or butter and eggs) create a dessert that punches well above its ingredient count.
For a quicker alternative, you can also try the no-bake lemon slice method, which uses crushed biscuits and condensed milk.
Frequently asked questions
Can I use bottled lemon juice instead of fresh?
Fresh lemon juice delivers a brighter flavour and consistent acidity. Bottled juice often contains preservatives that can alter the setting reaction with condensed milk. If you must use bottled, expect a slightly softer slice.
How can I make lemon slice gluten‑free?
Use gluten‑free plain sweet biscuits (or gluten‑free graham crackers) for the base. The remaining ingredients are naturally gluten‑free. Check the condensed milk label for cross‑contamination warnings if you are celiac.
Why did my lemon slice not set?
Most common reasons: too little condensed milk, too much lemon juice (the acid‑to‑milk ratio is delicate), or insufficient chilling time. Always measure the condensed milk by weight, not volume, for accuracy.
Can I reduce the sugar in lemon slice?
Reducing sugar affects both flavour and structure. The condensed milk provides sweetness and acts as a binder; swapping it for a low‑sugar version will yield a softer set. For the baked variety, the sugar in the curd helps thicken the eggs.
What type of pan should I use for lemon slice?
A 20 cm (8×8 inch) square metal or glass pan works best. Line it with baking paper so the slice lifts out cleanly. Avoid non‑stick pans with dark coatings, as they can over‑cook the base in the baked version.
Can I add fruit or other flavours to the topping?
Yes. Swap half the lemon juice for lime or passionfruit pulp. Fold in fresh blueberries or raspberries before chilling for a fruity variation. The condensed milk will still set.
How do I cut clean, even slices?
Use a long, sharp knife and wipe it clean between cuts. Chill the slice for at least 4 hours before slicing. For the no‑bake version, dipping the knife in hot water and drying it helps glide through the coconut.
Is lemon slice the same as lemon cheesecake?
No. Lemon cheesecake contains cream cheese and often requires baking or gelatin. Lemon slice has no cream cheese; its structure comes from condensed milk and biscuit crumbs.
Ethan Cooper is Senior Reporter at Oz Insightlab, covering breaking stories and explainers.