I often do a covered spread with crusty Italian bread/sourdough
and dipping plates of Olive Oil, Balsamic vinegar and Dukkah.
They are free to nibble while waiting if they come early (some clients stay well beyond their appointment time). They cannot eat while they are having their nails done, although many resort to feeding each other.
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Many of my clients are regulars, run into each other on their regular times and they only know each other via the salon (they love a good gossip) and it means I don't have to entertain them so much.
They also "plot" to bring a bottle on their next crossover and take turns, I only drink during my last 2 appointments of the day Thurs/Fri (if I'm in the mood and have had the time to eat during the day).
I've been doing the same clients for so long, it's their resposibility to bring "me" coffee (I don't have the time) and have wasted many pots of coffee over the years, so I gave up making it.