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Béchamel is one of the five mother sauces of French cuisine—but you don't need professional chef training to make it. Also known as white sauce, béchamel is versatile and creamy; it is made from milk and thickened with a roux of flour and butter. This sauce is used in lots of comforting recipes, from lasagna and mac and cheese to gratins and casseroles.
Ingredients
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3 tablespoons unsalted butter
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¼ cup finely chopped onion
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¼ cup all-purpose flour
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½ teaspoon coarse salt
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4 cups whole milk
Directions
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In a medium saucepan, melt butter over medium. Add onion and cook until softened, about 6 minutes. Add flour and salt; cook, stirring frequently, until mixture is pale golden, has a slightly nutty aroma, and is the texture of cooked oatmeal, about 5 minutes.
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Whisking constantly, pour in 2 cups milk; add 2 more cups milk and whisk until smooth. Cook mixture, stirring constantly along the bottom of pan, until boiling, about 7 minutes.
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Reduce heat to low. Simmer gently, stirring occasionally, until sauce thickens and does not feel grainy when a very small amount is rubbed between two fingers, about 10 minutes.