It was a Tuesday evening after 10 and we needed a place serving drinks and food, and it needed to be vegetarian, cheap, and open. Fortunately, One World Café's kitchen is open until 11 p.m. and the bar is open until 2 a.m. every night except Sunday, when they close at 5 p.m. They even have a Tuesday night special of half-priced margaritas ($3.50), black bean burritos ($4.23), and quesadillas ($4.23). Sure, it has that "coffee shop with a bar" atmosphere: The walls are orange and spotted with work from local artists, the bar itself is some kind of tiled mosaic, and the lights are warm but bright enough to illuminate the 40 or so books burying a premed student at the table behind us. (It is, after all, practically on the Johns Hopkins Homewood campus.) One World does, however, have a well-stocked bar with about five beers on tap (including Allagash, one of those wheat beers served with an orange), and the seasoned bartenders can pour serious drinks. The margaritas tasted of rail tequila, but they were strong, and weren't loaded up with half a glass of sour mix--in fact, they use fresh-squeezed lime juice--so we could stomach more than one. The black bean quesadilla was delicious, despite its floppy texture, and was large enough for leftovers. While the bar was quiet that Tuesday evening, the happy hour can get downright boisterous. If you should tempt it, be prepared to bump elbows with the college elite; this is the sort of place where the bar fights are strictly intellectual.