MirepoixSet up before turning on the heat
Weigh the butter and flour, measure the liquid, and put the whisk within reach. Use a pan with space for vigorous stirring. If the recipe calls for warm milk or stock, prepare it separately so that you are not leaving the roux unattended.
Melt the fat and combine it with the flour until no dry pockets remain. The intended colour depends on the sauce. A pale béchamel and a darker stock-based sauce are different projects, even when they begin with the same two ingredients.
Control the first liquid additions
Add a manageable amount of liquid and whisk across the whole bottom and into the corners. The mixture may first become a thick paste. Smooth that paste before adding more; immediately flooding a lumpy paste makes the lumps harder to locate.
Continue in additions, scraping and mixing evenly. Once the base is uniform, incorporate the remaining liquid as the recipe directs. Avoid treating a number of whisk strokes as a universal cooking instruction.
Diagnose before trying to rescue
If the sauce is too thick, a little compatible liquid can change its consistency. If it contains small lumps, moving it off the heat gives you time to whisk or strain. A scorched flavour is a different problem; scraping burnt material through the sauce will distribute it.
Check the taste and serving texture after the flour has cooked. Note the liquid, flour and final yield. That record is more useful for your next batch than remembering only that you added 'a bit more milk'.
- Separate preparation, mixing and final seasoning.
- Use controlled heat and reach the pan edges.
- Do not label a smooth but raw-tasting sauce finished.