Philip Ward, head barkeep at Death & Co., is hoping to broaden the relatively small world of Manhattan mixology by launching a bartender exchange program that he says is the first of its kind. This week the bar welcomes Kirk Estopinal from Chicago’s the Violet Hour, who brings to the bartop his own house-made bitters and a little something known as a “black lime,” wherein a lime is cooked in salt water, dehydrated, and zested into a drink such as a tea punch. (Let's hope someone has told the out-of-towner to glove up before handling the lime — the Health Department is watching.) Next month Ward swaps duties with a bartender at Alembic, a San Francisco favorite, and the following month a mixologist from London cocktail mecca the Lonsdale will cross the pond. If you can think of any other mixologists who’d be an asset to Death & Co. (and who are based in cities its bartenders might actually want to travel to), do name them in the comments.