Stoli with a twist

A man walks into a Chinese restaurant but is told by the Maitre'd that there will be at least a twenty minute wait. "Would you like to wait in the bar, Sir?", he says. The man goes into the bar and the bartender says, "What'll it be?" The man replies, "Give me a Stoli with a twist." The bartender pauses for a few seconds, then smiles and says, "Once upon time, there were FOUR little peegs. . ."