Purple wild basil?

Perhaps I should post this to the Kitchen Garden discussion, but I'll try it just here first. It looks like Herbs and Kitchen Garden don't get used so much. A plant has volunteered into my neighborhood which they say is a wild member of the basil family. It's a tall, branched single stalk which spreads easily and has deep purple leaves. Rubbed, the leaves have a basil scent, but the taste is not quite like green basil. They are a little bitter, kind of like some of the mesclun lettuce types. But, mixed with regular lettuce in a salad, they have a nice, and mild, flavor - and the color mix is beautiful. Does anyone grow this, and does anyone eat it? I've been eating it for a few weeks now and am still thriving, so I must say it's an edible plant. Does anyone use it any other way? I'm just using it almost like a lettuce leaf, rather than an herb. By the way, I planted it next to mistflower, and the combination in the garden is so pretty that I have also used it in a bouquet. The mistflower is blooming now, and the purple plant has buds that should blossom soon.