Julep cup
The straight-sided metal cup a julep is churned and served in, near always silver or pewter. The metal is the point rather than the shape: it frosts as the crushed ice takes hold, which is how a maker knows the drink is ready and why the cup is held by its base and rim.
Public domain · Cropped, white-balanced, graded and re-encoded to WebP by eXir.
An empty, polished silver julep cup with a tapered shape and ribbed base, on a plain background
Capacity
Solid ice only: the liquid fills the gaps between pieces, so what is subtracted is the ice itself. Scaled from the rocks glass on capacity, since the two are the same shape family and a julep cup is packed to the brim with crushed ice by design. Crushed is taken as 7% above cubed: loose crushed ice weighs about 593 to 640 kg per cubic metre against 917 for solid ice, roughly 65% solid, where loose cubes run about 61%.
Every drink below was checked against this figure at build time. A recipe that does not fit its stated vessel fails the build rather than shipping.