Another rotisserie chicken source, woohoo. The excitement is palpable. Chicken Out (hq in Rockville, with 12 DC-area locations) is average, fine if you’re nearby and craving chicken but not worth seeking out, in nearly every way — chicken, mashed potatoes, caesar salad, all good but nothing special. But the potato salad, for some reason, is superb, and simple too: mostly just potatoes and egg, a little mayo, salt, pepper, a few scallion bits. Could the secret ingredient be celery seed? Cook’s Illustrated has established the subtle importance of celery seed to awesome potato salad. In any case, I wish our local supermarkets had potato salad this good.