Although not all children may enjoy eating them, it is fairly safe to assume that most students will at least know what ring doughnuts are, and what they look like. Familiarity with these intriguingly-shaped items of patisserie means that students will not immediately be daunted at the thought of doing some mathematics with the relatively complicated mathematical objects they approximate, namely "tori"--"torus" in the singular. In this article, the author provides a stretching theoretical challenge for able Year 10 pupils. The aim is to obtain a formula for the volume of a torus so that the approximate volume of any given ring doughnut may easily be calculated. (Contains 3 figures.)