On tap

On tap: 1.) diz-se da cerveja servida de um barril ou de um       

                     “keg”

“Do you have any imported beers on tap here? I like beer on tap. The canned stuff tastes funny to me.”

                 2.) Disponível  imediatamente:

 “I have just the kind of person you're talking about on tap.”

“The cook has any kind of food you might want on tap.”   (www.thefreedictionary.com)