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1
Heat the oven to 160 °C. Spread the almonds on a baking tray in a single layer and toast for exactly 12 minutes. Remove and hold warm — under-toasted almonds contribute nothing to the finished torrone; over-toasted turn bitter against the sweet honey base.
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2
Place the honey, lemon zest strip and vanilla in the upper vessel of a bagnomaria set over barely simmering water. The water must not touch the base of the upper bowl. Warm the honey gently, stirring, until it is fully liquid and aromatic.
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3
Beat the egg whites to stiff, glossy peaks in a clean bowl. The peaks should stand upright and not fall when the whisk is lifted.
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4
Fold the beaten egg whites into the warm honey in the bagnomaria. Cook the combined mixture, stirring constantly with a wooden spoon or heat-resistant spatula, for 30 to 45 minutes. The temperature must not exceed 80 °C at any point — this is where the dish lives or dies: too high and the egg white scrambles, producing a granular, broken mass rather than smooth, cohesive nougat. Monitor with a thermometer throughout and adjust the heat under the water bath accordingly. The mixture is ready when it forms a firm ribbon that holds its shape when lifted from the spoon, and a small drop placed in cold water forms a firm thread that can be gathered between the fingers.
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5
Remove the lemon zest. Fold in the warm toasted almonds quickly and decisively — the mixture begins to firm the moment it leaves the heat and delay makes even distribution impossible.
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6
Lay two sheets of wafer paper on a clean work surface or in a lightly oiled 20 × 30 cm frame. Pour and spread the torrone mixture in an even layer, then lay the remaining sheets of wafer paper on top. Press firmly and evenly with a flat board. Weight the board overnight at room temperature — this sets the structure and expels any remaining air bubbles. The slab is ready when it holds a clean edge under a sharp knife with no crumbling.
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7
Unwrap and cut into portions with a sharp, heavy knife — a rocking motion rather than a sawing one gives a clean face. The cut edge should be smooth and slightly translucent, not porous or honeycombed.