1. Toast the Nuts
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Preheat your oven to 350°F (175°C).
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Spread the almonds and pistachios in a single layer on a baking sheet.
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Toast for 8-10 minutes, until fragrant and lightly golden. Set aside to cool completely.
2. Prepare the Syrups
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In a medium, heavy-bottomed saucepan, heat the honey over medium heat, stirring occasionally, until it reaches 250°F (120°C) on a candy thermometer.
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In a separate saucepan, combine the sugar and water. Heat over medium heat, without stirring, until the mixture reaches 300°F (150°C).
3. Whip the Egg Whites
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While the syrups are heating, place the egg whites in the clean, dry bowl of a stand mixer.
4. Combine the Mixtures
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With the mixer running on medium speed, carefully and slowly pour the hot honey into the whipped egg whites.
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Once incorporated, gradually pour in the hot sugar syrup while continuing to whip. The mixture will become thick, glossy, and voluminous.
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Continue to whip for a few more minutes until the bowl feels just warm to the touch.
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Switch to a spatula and gently fold in the cooled, toasted nuts and your choice of vanilla extract or citrus zest.
5. Shape and Set
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Line a loaf pan or small baking dish with edible wafer paper.
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Top with a second sheet of wafer paper, pressing gently to adhere.
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Let the torrone rest at room temperature, undisturbed, for at least 4 hours or preferably overnight to set completely.
6. Slice and Serve
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Once fully set, turn the torrone out onto a cutting board.
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Using a sharp, heavy knife, slice it into bars or squares.
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Store in an airtight container at room temperature to maintain its perfect texture.