Add the flour to the melted butter. Whisk constantly for 1–2 minutes until smooth and slightly foamy.Goal: Cook out the raw flour taste while keeping the roux pale.
Start the Milk Slowly
Add a small splash of warm milk (just a few tablespoons). Whisk vigorously until the mixture becomes smooth and paste-like.Why this matters: This step prevents lumps before they start.
Add the Remaining Milk Gradually
Slowly pour in the rest of the milk while whisking continuously. Keep the mixture moving so it stays smooth.Tip: Don’t rush—steady pouring = silky sauce.
Simmer & Thicken
Reduce the heat to medium-low. Cook, whisking frequently, until the sauce thickens enough to coat the back of a spoon, about 5–7 minutes.Test: Run your finger across the spoon—if the line holds, it’s ready.
Season & Finish
Add salt, white pepper, and a pinch of nutmeg (optional but classic). Stir well and taste.Adjust: Add more milk if too thick, simmer longer if too thin.
Notes
Béchamel isn’t about memorizing steps—it’s about controlling texture. Once you understand how the roux thickens the milk, you can adjust this sauce on the fly for any dish.