Book 27, Question 54
Why is fudge smooth but rock candy crunchy?
Both are sugar crystals, but they are different sizes.
Rock candy forms slowly and grows large crystals you can crunch. Fudge makers cool the hot candy mixture and then beat it, which starts millions of tiny crystals that are too small to feel, so it is smooth. The size of the crystals decides the texture. Cooking hot sugar is for grown-ups only.