Besciamella is the Italian béchamel—a smooth, velvety white sauce of butter, flour, and milk that serves as the essential binding and enriching layer in lasagne alla bolognese, cannelloni, crespelle, gratin dishes, and vegetable timballi across Italy. While the French claim béchamel as one of their mother sauces (named for the Marquis Louis de Béchameil, maître d'hôtel to Louis XIV), the Italians argue persuasively that it was imported from Italy to France by Catherine de' Medici's Florentine cooks—and indeed Pellegrino Artusi (1891) and Italian cookbooks before him document 'balsamella' as an established Italian preparation. Regardless of origin, besciamella is essential to Italian layered and baked dishes: it provides moisture, creaminess, and a binding function that holds layered preparations together while creating the golden, blistered crust that makes baked pasta dishes irresistible. The preparation is a classic roux-based sauce: butter is melted, an equal weight of flour is stirred in and cooked gently for 1-2 minutes (without browning—this is a white roux), then hot milk is added gradually, whisking constantly to prevent lumps, and the sauce is cooked gently until it thickens to the desired consistency. For lasagne, besciamella should be medium-thick (coating the back of a spoon); for lighter applications, it can be thinner. A grating of nutmeg is the essential Italian seasoning—it transforms the sauce from bland to subtly warm and aromatic.
Equal parts butter and flour, cooked into a white roux. Add hot milk gradually, whisking constantly. Cook until thickened to desired consistency. Season with salt, white pepper, and nutmeg. Essential for lasagne, cannelloni, and baked pasta dishes. The roux must not brown—this is a white sauce.
Heat the milk in a separate pan first—hot milk integrates into the roux smoothly without lumps. Add the milk in thirds: first third is vigorous whisking until absorbed, then the sauce becomes smooth and subsequent additions are easier. If lumps form, pass through a fine sieve. A bay leaf steeped in the milk while heating adds subtle depth. For lasagne, the besciamella should be slightly thinner than you think—it thickens further during baking.
Adding cold milk (causes lumps). Not whisking constantly (lumps form). Browning the roux (this is a white sauce, not a brown one). Skipping the nutmeg (essential Italian touch). Making it too thick (should be pourable for most applications). Under-cooking (raw flour taste persists—cook at least 5 minutes after thickening).
Pellegrino Artusi, Science in the Kitchen; Marcella Hazan, Essentials of Classic Italian Cooking