One of the best burgers we've ever eaten is the version served by chef Jan Birnbaum at Epic. And it ought to be, since the three-quarter-pound burger, called the Ultimate, is $25 at dinner, and the lunchtime half-pound version is $20. The big, chunky patties are made with meat that's ground daily, and served on a big bakery bun with greens, tomato, housemade pickles, big wedges of fries, and cups of bacon bits, fresh corn relish, grain mustard, sautéed mushrooms, and aioli. These days Epic is offering a special upstairs in its Quiver Bar at lunch: the half-pound burger, a cold beer, and a chocolate brownie, all for $20.