A drinking vessel 38 in which {HEAD ~ a beverage}, for example a draught beer, is to be served is cooled by formation thereon of ice formed of {TAIL ~ frozen potable liquid} for example a small volume of the same beer 
A drinking vessel 38 in which { HEAD ~ a beverage } , for example a draught beer , is to be served is cooled by formation thereon of ice formed of { TAIL ~ frozen potable liquid } for example a small volume of the same beer
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH