Which thickening agents add body and when should they be added?

Which thickening agents add body and when should they be added?

• A. Roux (added at the beginning) and cornstarch (activated with cold water and added in the middle)
• B. Roux only
• C. Cornstarch only
• D. Gelatin only

Answer: (A)

The idea is how two common thickening methods build body and when to use them in a sauce. A roux, fat cooked with flour, forms the base that gives real body and depth as it simmers. It’s typically started at the beginning so the flavors develop and the starches swell smoothly, creating a stable, velvety thickness. Cornstarch, on the other hand, must be mixed with cold water to make a slurry to prevent lumps, then added during cooking to fine-tune and finish the sauce’s thickness. This lets you control viscosity mid‑cooking without overcooking or breaking the sauce. Using both in tandem—roux at the start for body, cornstarch slurry added in the middle to adjust thickness—gives a sauce with good texture and a glossy finish. Gelatin thickens differently (more for setting than for hot sauce body), so it doesn’t fit this hot-thickening approach.

The idea is how two common thickening methods build body and when to use them in a sauce. A roux, fat cooked with flour, forms the base that gives real body and depth as it simmers. It’s typically started at the beginning so the flavors develop and the starches swell smoothly, creating a stable, velvety thickness. Cornstarch, on the other hand, must be mixed with cold water to make a slurry to prevent lumps, then added during cooking to fine-tune and finish the sauce’s thickness. This lets you control viscosity mid‑cooking without overcooking or breaking the sauce. Using both in tandem—roux at the start for body, cornstarch slurry added in the middle to adjust thickness—gives a sauce with good texture and a glossy finish. Gelatin thickens differently (more for setting than for hot sauce body), so it doesn’t fit this hot-thickening approach.