Kebab and White Sauce. Whisk into cold milk, then heat gently to a silky white sauce without lumps. Layer into lasagne, pour over vegetables, or use as a base for gratins. A pinch of nutmeg or cheese rounds out the flavour nicely. Simple to portion for weeknight cooking. Store in a cool, dry place; reseal the sachet or jar after opening. Once prepared, serve hot; refrigerate leftovers promptly and use within a short time. For a smoother texture, bring to a brief simmer while whisking; reduce gently if you prefer a thicker pour. Finish the dish with fresh herbs or a small knob of butter to add shine right before serving.