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Prepare the Béchamel sauce: melt a half tablespoons butter in a small saucepan over medium heat. Stir in the flour and cook for a few minutes without allowing it to color. Whisk in the milk. Continue whisking until the sauce thickens. Set aside until needed.
2
Blanch the onions in boiling, salted water for 15 minutes. Rinse well and drain thoroughly. Place in a saucepan along with half the butter. Cook over low heat until the onions are very soft and a bit dry. Do not let the onions color.
3
Mix in the Béchamel sauce. Season with salt, pepper, nutmeg, and paprika. Continue cooking over low heat for an additional 10 minutes. 4. Just before serving, purée the mixture with a stick blender. Stir in the remaining butter and a spoonful of crème fraîche.