Caramel Apple Bars

STEP 1: REDUCE THE CIDER

Pour the unfiltered apple cider into a wide pan and bring to a brisk simmer. Reduce, uncovered, until you have about 1/3 cup (80 ml) of syrup that coats a spoon, roughly 30-35 minutes. It should smell aggressively of apple, sharper and more concentrated than any cider you would drink. Stir in the lemon juice off the heat and set aside to cool. Reduced cider delivers apple as a concentrate rather than as water, which is what fresh fruit and apple butter mostly are.

STEP 2: BAKE THE BASE THIN

Heat the oven to 325F (160C). Line the pan with parchment, leaving a generous overhang on all four sides. Beat the softened butter and caster sugar until just combined and pale; do not aerate it, as shortbread wants density rather than lift. Add the vanilla extract. Whisk the all-purpose flour, rice flour, powdered freeze-dried apple and fine sea salt together, then work them in until the dough just comes together. Press into the pan in an even layer no more than 1/4 in (6 mm) deep, using a bench scraper to level it and square the corners. Dock all over with a fork. Bake 22-25 minutes until pale gold at the edges and dry to the touch, then cool completely in the pan.

STEP 3: MAKE THE APPLE-WHISKEY CARAMEL

Combine the granulated sugar and water in a heavy-bottomed saucepan. Swirl once to wet the sugar, then leave it alone. Cook over medium-high heat, without stirring, to a deep amber at about 340F (171C) on the sugar thermometer. Take it off the heat and add the warmed heavy cream in a slow stream, standing back, as it will erupt. Whisk smooth. Add the cubed butter, ground cinnamon and flaky sea salt, then the apple cider reduction and the bourbon whiskey. Return briefly to low heat and cook to 240F (116C), which gives a caramel that sets sliceable rather than runny. Fold in the diced dried apple.

STEP 4: LAYER THE CARAMEL TO MATCH THE BASE

Pour the caramel over the cooled shortbread and spread level with an offset spatula. Aim for the same 1/4 in (6 mm) depth as the base: stand at eye level to the pan and check that the two layers read equal in the side profile. Chill 45 minutes until firm but not fridge-hard, so the ganache can key into it.

STEP 5: MAKE THE GANACHE

Bring the heavy cream just to a simmer and pour it over the chopped dark chocolate. Leave 2 minutes, then stir from the centre outward until glossy and smooth. Stir in the bourbon whiskey and the apple cider reduction, then the softened butter for shine and body. Pour over the chilled caramel in a thin, even layer and return to the fridge for at least 1 hour, until fully set.

STEP 6: CUT TO EXACT SIZE

Lift the slab out using the parchment overhang and set it on a board. Trim all four edges square, taking a scant 1/4 in off each side. Measure with a metal ruler and mark every cut before you make any of them: for 16 bars from a 9 x 13 in slab, cut into 4 columns and 4 rows, giving bars of roughly 3 x 2 in (7.5 x 5 cm). Dip the knife in just-boiled water and wipe it dry before every single cut, pressing straight down rather than sawing. Chill the cut bars 20 minutes on a parchment-lined tray, spaced apart.

STEP 7: TEMPER THE CHOCOLATE

Chop the dark couverture chocolate. Melt two-thirds of it over a bain-marie to 113-122F (45-50C), keeping every trace of water away from the bowl. Remove from the heat, add the remaining third as seed, and stir steadily until the mass drops to 81F (27C). Return it to gentle heat and bring it up to a working temperature of 88-90F (31-32C), no higher. Test before you commit: smear a little on a strip of parchment and leave it 3 minutes at cool room temperature. Properly tempered chocolate sets glossy, hard and streak-free in that time. If it stays tacky or dulls, reheat, reseed and start again.

STEP 8: ENROBE THE BARS

Bring the bars up from fridge-cold to around 60F (15C) before dipping, roughly 10 minutes at room temperature; chocolate applied to a bar straight from the fridge condenses, and condensation dulls the finish. Lower each bar ganache-side down into the tempered chocolate using a dipping fork, lift, tap off the excess against the rim, and draw the underside across the rim before setting it on the wire rack. Scatter a few crushed freeze-dried apple pieces onto the surface while it is still wet.

STEP 9: PIPE THE DECORATION

Reserve a few tablespoons of the tempered chocolate. Once the coating has set matte-firm to the touch, 10-15 minutes at cool room temperature, fill the piping bag or paper cornet and finish each bar with a fine, even decoration: parallel diagonals, or a tight zigzag, applied in one continuous confident pass per bar. Consistency across the batch matters as much here as it does in the cutting.

STEP 10: SET AND SERVE

Leave the finished bars at cool room temperature, 64-68F (18-20C), for at least 1 hour to set fully and develop their gloss. Do not refrigerate to speed this up, as the shock will bloom the chocolate and cost you the shine. Serve at room temperature, which is also where the apple reads most clearly.