Why are bones used in stock and what does collagen contribute to the finished product?

• A. Bones provide collagen that gelatinizes during long simmering, giving body, mouthfeel, and a velvety texture.
• B. Bones add salt.
• C. Bones make stock sweeter.
• D. Bones thicken stock with starch.

Answer: (A)

Bones contain collagen that, with long, gentle simmering, breaks down into gelatin, which gives stock body and a velvety mouthfeel. As collagen dissolves into the liquid, gelatin coats the palate and helps the stock feel fuller and smoother, especially when it’s cooled and then warmed again. This is why bone-based stock has that rich, rounded texture that non-bone stocks often lack. Salt comes from seasoning, not the bones themselves, and bones don’t make stock sweeter. Thickening with starch is a separate technique, not the result of collagen.