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A second North End is not very far from downtown (of Frankfurt the first block south of Mellwood). You'd be able to get a wide variety of food options from breakfast items to sandwiches to entrees.
I frequent Toast on Market St. (736 East Market Street) on Sundays. They're open from 7am-3pm and serves breakfast and lunch (I never seem to be able to forgo their breakfast so I haven't tried their lunch menu yet, but they sound fantastic!)