Pesachim 54 – פסחים נד
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Tosfos points out that the allowance to taste food without swallowing is limited to a taanis yachid (personally enacted fast) but is not permitted during a taanis tzibbur (a public fast). If we see that tasting doesn’t require a bracha then obviously it doesn’t constitute eating, if so why is it forbidden on a taanis tzibbur more than by a taanis yachid?