Windowsill basil. The plant was headed for the compost at work a few months ago, but my coworker said I could rescue it (there were a bunch of herbs, vegetables, and annual flowers that were all scraggly and getting tossed). I'm a bit dubious about keeping herbs going inside for several months, but so far so good. Also good added to salads. (It's some kind of purple basil, not the usual Italian basil)