It's called 'Bicerin' & my sister in law discovered it at Carluccio's today.
Little pots of cream, espresso & thick dark chocolately sauce that you pour into your cup to mix your own mocha. Delicious although a little cold, could do with the cream being hot or some hot milk alongside too. But I'm not going to quarrell.
Great idea, great service & italian smiles all round on a sunny shopping saturday in September.