Remember after-dinner mints? The wafer-thin store-bought versions were slipped onto saucers, still in their individual wrappers, and served with coffee at the end of the meal. We've turned them into biscuits - feel free to serve whenever you fancy.
Note Peppermint extract is a a natural extract rather than a synthetic essence, and it has a pure clean flavour. It's available from specialist cake supply shops and delicatessens.