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1
Melt butter over medium heat until foaming, then whisk in flour to form a pale roux, stirring constantly for 2–3 minutes until it no longer smells raw.
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2
Gradually whisk in warm stock in three additions, ensuring each is fully incorporated and no lumps form.
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3
Bring to a simmer over medium-high heat, whisking frequently.
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4
Reduce heat to low and simmer gently for 20 minutes, skimming impurities that rise to the surface every 5 minutes.
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5
Pass through a fine-mesh sieve into a clean pot.
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6
Season with salt and white pepper; hold at 65–70°C until service.