Waspy Europeans with their genteel hangover remedies — vodka and tomato, champagne and orange juice, lemon and bitters — might as well just grab an ice pack and crawl back into bed: Nobody knows what to do with the morning-after like the Peruvians. The folks who invented the Pisco Sour know that an even sourer dawn is best banished by a little hair of the fish with lime juice; we're talking the stuff left over when all the ceviche's eaten and you're left with just the milky, pucker-inducing dregs. Add enough dark beer or spirits to this quaff and you'll find your spirits raised considerably. At Rosa Nautica, a hole-in-the-wall Peruvian cafe nobody knows about but you and me, they name these concoctions after the milk and blood of tigers, bears, and other carnivorous creatures, but drink one of these babies and believe it, you'll tame the beast.