It was just before 6 p.m. on a recent Tuesday when the bartender aimed the blowtorch at the fruit lying on a tiny hibachi grill and pulled the trigger. An orange slice and a cherry took on a glistening sheen as they burned. Then the bartender muddled the fruit into a burnt sugar old-fashioned, a rough-and-tumble twist on the dignified classic.Staff members were scurrying through Clio, James Beard award-winning chef Ken Oringer's flagship restaurant in Boston. Couples and small confederacies of businessmen settled in at tables in the dining room, whose neutral tones and unflashy decor lend it a coziness not usually expected from a restaurant that serves foie gras ravioli and roasted muscovy duck and confit.The unpretentiousness is also unmistakable at the bar, where paintbrushes, blackened Middle Eastern limes and blowtorches are just a few of the objects not commonly found beside shakers and strainers. Todd Maul, the bar manager, explained my next drink."We take Mayflower Porter and stick-blend it in an immersion blender with yellow beets and pink peppercorns, then spin it out in a centrifuge to give it the feel of an amaro. You just get the coffee and hoppy and chocolate notes of the porter," he explained as offhandedly as if he were giving directions to the restrooms. "Then it's cut with Carpano vermouth. I didn't want it to be too heavy, so I used Canadian whiskey to lighten it up. Instead of using beer as the forward part of it, I wanted the beer notes."All I could do was marvel at this thing of beauty.A drinking townWhen it comes to drinking in Boston, the options have long fit the stereotypes. In the beating heart of Red Sox Nation, you have an excess of sports bars. And if there's a game on, you'd better believe that even higher-end bistros will have televisions playing to rapt imbibers at the bar.But it has become much easier to find bartenders who can wax esoteric about their drinks. Yes, this craze coincides with the cocktail renaissance that has emerged in major cities internationally, but in Boston, it's a delicious affirmation of a reinvigorated city stripped of many of its stereotypes.The serene, sublime No. 9 Park, which overlooks Boston Common and opened in 1998, was James Beard award-winning chef Barbara Lynch's first endeavor. It features a lounge that's as much a destination for hipster cocktail nerds as the dining room is for the legions who come to celebrate graduations, anniversaries and done deals. On a recent Saturday evening, the two young, engaging bartenders greeted us with tavern-caliber casualness and nonchalantly explained such drinks as the Swamp Water Fix."A couple on a hot day asked if we'd ever heard of a swamp water. They said they used to drink them at the Rat in the '70s," explained bar director Ted Kilpatrick, referring to the Rathskeller, a Boston club that existed from 1974 to 1997 and hosted bands such as the Police and Talking Heads in their early days. "It was Chartreuse and pineapple juice over crushed ice in a mason jar.... We dry it out by using Batavia-Arrack and Chartreuse, and use pineapple juice, syrup and lime to make it a proper fix, the way it was made historically. It's more complex and funkier."On the spot where the Rat once stood is Eastern Standard, in the Hotel Commonwealth. It's mere blocks from Fenway Park in Kenmore Square, a beer guzzler's Shangri-La. Garrett Harker, Lynch's former business partner, opened this gorgeous brasserie, where bartenders crank out exquisite cocktails with top-rate craft spirits, in 2005. It set off the rejuvenation of the long-scrappy Kenmore and, with that, the democratization of craft cocktails."People respond to something that's well-made and handcrafted," Harker told me. "I watched the cocktail become exclusive.... We wanted to do something that's accessible at any level and give it the same attention the chefs give to the food in the kitchen."Art of improvisationHarker opened Island Creek Oyster Bar at the other end of the sprawling Commonwealth in 2010. It was with a voracious midwinter craving for seafood that a friend and I arrived at this very modern reimagining of the classic New England seafood joint.As we sat at the bar watching oyster shuckers at work, a bartender asked us what spirit we were in the mood for. In keeping with our warm-weather longings, "tequila" was my nearly reflexive response. He reappeared minutes later with a thrilling off-menu concoction: tequila, muddled cucumber, agave syrup, cinnamon syrup, fresh lime and grapefruit juice. A trace of sriracha curbs the sweetness. The finale? A few quick twists of a pepper mill. The margaritalike underpinning was familiar and comforting; all the embellishments made it an imaginative thrill, and a delightful aperitif before a plate of lustrous oysters arrived.When we finished, we were escorted next door to the Hawthorne, the third of Harker's tippling trinity at the hotel. This subterranean den is decked out with plush couches and chairs, dark wood furniture, and glass tables, to give it a snug yet classy living-room feel. And the surgeon-caliber attention that the spiffy barkeeps give to the most ethereal gin fizz I've had since my last visit to New Orleans seals the deal, making anyone feel like the guest of honor.Most Bostonians wouldn't consider O Ya an option for a casual sip, but this swanky (and pricey) nouveau sushi boite has a laid-back charm. This is where the gracious Nancy Cushman, sake guru and co-owner with her husband, chef Tim Cushman, another Beard winner, will regale you with the nuances of the sakes in her collection -- from earthy varieties and delicate fruit-forward types to unfiltered styles with a "cooling effect," all served in your choice of ceramic vessel.This is where she'll warn you of the "googly-eye effect" caused by the gem-size sushi bites, especially when paired with the right sake.This is where you'll sit at the sushi counter and watch the chefs prepare morsels such as hamachi with banana pepper mousse and a sprinkling of truffle oil. The delicate fish gets its gloss and rich flavor after being flamed with -- you guessed it -- a blowtorch.