A spiral ham is actually a spiral sliced ham. This is the butt end or shank end of a whole ham and yes, typically probably 3kg at a minimum. The 'spiral' part i

A spiral ham is actually a spiral sliced ham. This is the butt end or shank end of a whole ham and yes, typically probably 3kg at a minimum. The 'spiral' part is that during processing it's been sliced in a spiral that leaves slices roughly 5-7mm thick. These are typically a little more expensive than unsliced bone in hams, but the convenience factor is huge. Hams like that often go on sale around US Thanksgiving and Christmas, with prices for them around US$4.50-6.50/kg last week and probably as 'loss leaders' around US$2-3/kg the week before Christmas. Ham is a regular part of 'traditional Thanksgiving' but not as much as turkey, whereas the 'Christmas ham' is definitely a thing.