Infuse the Milk: In a saucepan, combine the milk, onion, cloves, bay leaves, and nutmeg. Bring to a gentle simmer over medium heat.
Steep and Steep: Reduce the heat to low, cover the saucepan, and simmer gently for 20-30 minutes, allowing the milk to infuse with the aromatic flavors.
Strain the Milk: Remove the saucepan from the heat and strain the milk through a fine-mesh sieve, discarding the onion, cloves, and bay leaves.
Add the Bread: Return the infused milk to the saucepan and add the torn bread. Stir to combine and let the bread soak in the milk for 5-10 minutes, until softened.
Simmer and Stir: Place the saucepan over low heat and simmer gently, stirring frequently, until the bread has completely broken down and the sauce is smooth and creamy.
Stir in Butter and Season: Remove the saucepan from the heat and stir in the butter until melted. Season to taste with salt and white pepper.
Optional Creamy Upgrade: For an extra decadent touch, stir in the double cream just before serving.
Serve and Enjoy: Serve immediately, alongside your roast dinner. Prepare for bread sauce bliss!