"Peter T. Daniels" wrote:

Which makes the server's question utterly impractical and
incomprehensible.

Sorry - I should have made it clear - the ham was presliced, with pricing in
metric and imperial units by weight. I assumed as it was priced by weight that
it would be sold by weight and that my stating "approximately" 100g would have
been sufficient for the server to work out how many slices that would equate to.
Later I noticed that other customers were asking for sliced lunchmeats by the
slice count as well - so it must be a local custom.