Drink of the Week: The Lancaster Where: Proof When Adam Bernbach was at Bar Pilar, he was among my favorite bartenders in town. He also briefly co-authored a cocktail column for us. It was a major coup when Proof was able to add Bernbach to their already heady booze team. And from the look of Proof’s drink menu, it’s turned into a great way for the bartender to spread his wings. The cocktail menu…