Maybe because lemon in a glass of water helps prevent kidney stones and folks are following their doctor's suggestion? Maybe because diners will simply add a packet of sugar to the glass to make a 'free' glass of lemonade?
I do not enjoy restaurant lemon water and learned long ago to simply ask for water no lemon! When they forget and bring lemon I simply discard the lemon on the placemat.
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Not sure if I have free time...or if I just forgot everything I was supposed to do!
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