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1
Roll pâte brisée to 3mm thickness on a floured surface; line a 25cm tart tin, prick base with a fork, and chill 15 minutes.
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2
Blind bake at 200°C for 12 minutes with baking paper and weights; remove weights and paper, then bake 5 minutes until pale golden.
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3
Render bacon lardons in a skillet over medium heat until crisp, drain on paper towels, and set aside; soften onions in bacon fat with butter for 8 minutes until sweet and translucent.
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4
Scatter bacon and onions over tart base, then sprinkle Gruyère AOP evenly over top.
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5
Whisk eggs with cream and milk until smooth; season with salt, Tellicherry pepper, and fresh nutmeg, then pour carefully into tart shell to 1cm from rim.
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6
Bake at 190°C for 25–30 minutes until custard is just set at edges but trembles slightly in centre.
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7
Cool 10 minutes in the tin; serve warm or at room temperature, sliced into wedges.