We didn't see these sliders coming when we ducked into the new Whitehall Exchange down the street from Hattie's. It's a small joint, just a bar, a few tables along the back wall and a men's restroom that looks like a structural afterthought, but, boy, did we demolish the Korean BBQ sliders they served up on an attractive, gastropub-ish white dish with cucumber sliced paper-thin and a side of aioli. The beef was juicy and flavorful, best washed down with a glass of bourbon. Solid as any bar food in Dallas, and a nice refuge when the Bishop Arts District goes night-night at 11 p.m. on a Saturday.