Millionaire's Shortbread
The Scottish three-layer slab: short, buttery shortbread base, a thick chewy caramel made from condensed milk and butter, a snappy milk-chocolate top. Cut into bars; eaten cold from the tin with strong tea.
Overview
A precise, three-stage bake. The shortbread base is rubbed-in, pressed into a lined tin and baked golden. The caramel is made on the hob: butter, sugar, golden syrup and condensed milk stirred over a low heat for about ten minutes until it thickens to soft-set fudge consistency. Poured over the cooled shortbread, chilled until firm. The chocolate top is melted, poured on, scored with a fork into wavy lines (the classic finish) or left smooth. Chilled, cut into 16 squares with a hot knife.
Ingredients
The shortbread base
- 200 g plain flour (plus extra for dusting)
- 60 g caster sugar
- A small pinch of fine sea salt
- 175 g unsalted butter (cold, cubed)
The caramel
- 175 g unsalted butter
- 175 g soft light brown sugar
- 4 tablespoons golden syrup
- 1 x 397 g tin sweetened condensed milk (full-fat)
- A small pinch of fine sea salt
The chocolate top
- 200 g milk chocolate (broken into pieces)
- 50 g dark chocolate (optional, for drizzle pattern)
Method
Stage 1 - Make the shortbread base
- Heat the oven to 160°C fan / 180°C / 350°F. Line a 20 x 20 cm square tin with baking paper, leaving a 2 cm overhang on two sides to lift the slab out later.
- In a wide bowl, whisk the flour, sugar and salt. Rub in the cold butter with your fingertips until the mixture looks like coarse breadcrumbs. Keep rubbing for another minute - the mixture should start to clump and feel slightly oily on the fingertips.
- Tip into the prepared tin. Press firmly into an even layer with your knuckles, then smooth flat with the back of a spoon. The base should be about 1 cm thick and uniformly compacted.
- Prick all over with a fork, ten times across. Bake for 25-30 minutes, until the surface is pale gold and the edges have just turned a deeper colour.
- Cool completely in the tin on a wire rack - at least 30 minutes. Don't pour the caramel onto a warm base; the caramel pools too thin.
Stage 2 - Make the caramel
- Combine the butter, brown sugar, golden syrup, condensed milk and salt in a wide heavy-bottomed saucepan.
- Heat slowly over a low heat, stirring with a wooden spoon until the butter melts and the sugar dissolves. The mixture should be pale gold and uniform - no grit on the spoon.
- Bring to a gentle simmer. Stir continuously now, getting into the corners of the pan - the sugar settles there and burns first. Continue stirring for 8-12 minutes. The caramel will darken from pale gold to deep amber, thicken to coat the back of the spoon, and start pulling away from the sides as you stir. Drop a small spoonful onto a cold plate; if it sets to a soft fudge consistency in 30 seconds, it's ready.
- Pour immediately over the cooled shortbread base. Tilt the tin so the caramel covers the entire surface, smoothing with the back of the spoon if needed.
- Cool to room temperature, then refrigerate for at least 30 minutes until firm.
Stage 3 - Add the chocolate top
- Melt the milk chocolate in a heatproof bowl over a pan of barely simmering water (don't let the bowl touch the water). Stir until smooth, then remove from the heat.
- Pour over the chilled caramel layer, tilting the tin so the chocolate spreads evenly to all corners.
- For the wavy finish: drag a fork across the surface in long S-curves before the chocolate sets. For the drizzle finish: melt the dark chocolate, pipe in straight lines across the slab, then drag a skewer perpendicular to create the feathered effect. Or leave smooth.
- Chill for at least 1 hour, until the chocolate has set fully.
Stage 4 - Slice
- Lift the slab out of the tin using the baking-paper overhang. Place on a board.
- Dip a long sharp knife in hot water, wipe dry, and cut. Wipe between cuts. The chocolate may crack if it's fridge-cold; let the slab sit at room temperature for 10 minutes before slicing to reduce cracking.
- Cut into a 4 x 4 grid for 16 squares, or 4 x 8 for 32 small fingers.
Notes
- The caramel is the heart of the bake: undercook and it slumps when cut; overcook and it sets brittle. Aim for "soft fudge" consistency on a cold-plate test. If unsure, take it off the heat sooner - caramel firms further as it cools.
- Condensed milk grade: full-fat sweetened condensed milk only. Reduced-fat versions don't thicken the same way.
- Chocolate ratio: the slab is heavy on caramel and benefits from a clean snap of milk chocolate on top. Some bakers use dark chocolate; it's less traditional but balances the sweetness.
- Tin size: 20 x 20 cm gives the canonical thick slab. A 20 x 30 cm tin gives thinner bars; reduce the chill times by 10 minutes.
Serving
A square on a small plate or in a paper case, with strong tea or coffee. Travel-bake material: holds well at room temperature for days, sturdy enough for a packed lunch.
Storage
- In an airtight tin at cool room temperature for up to a week. Refrigerate in summer or warm kitchens; the chocolate softens above 22°C.
- Freezes well for up to 2 months wrapped tightly. Defrost in the fridge to keep the caramel from sweating.
- Don't stack the squares directly - the chocolate top of one sticks to the underside of the one above. Separate with baking paper.
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