According to an article in the Chicago Tribune, Yolk is planning to expand, with founder Taki Kastanis saying that he may target cities such as Boston, New York, and Washington, D.C. for a smaller version of his restaurants where customers would order at the counter with the orders then being brought to their tables. The post mentions that Kastanis ultimately sees a total of 40 locations of Yolk opening, which would be up from a possible 15 by the end of this year--and in addition to smaller versions like those that could come to Boston and other East Coast cities, he envisions an even smaller version that could be set up at such places as train stations.
Yolk started out in downtown Chicago back in 2006 and currently has 10 locations in Chicago, Indianapolis, and Dallas/Fort Worth. The dining spots offer upscale versions of breakfast and lunch, including such items as waffles, French toast, omelets, benedicts, blintzes, crepes, soups, salads, and sandwiches.
The website for Yolk can be found at http://eatyolk.com/
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[Related article from our sister site (Boston's Hidden Restaurants): Slideshow--Twelve Breakfast Dishes/Items from Restaurants in the Boston Area and Beyond]