“Maybe it’s the rising popularity of cold brew, or the ever-present boozy brunches in D.C., but for some reason, many hot bars and restaurants around town are combining coffee and alcohol into one cool drink for the summer. (At Boqueria) The Leche de Pantera ($10), available at brunch only, comes with vodka, coffee, and condensed milk. The Barcelona-style tapas bar tops it with “Panther Powder.”