Little Tokyo’s (Metairie, Mid-City, and lately of Boutte)  salmon vegetable miso soup just might be the perfect cold-weather takeout soup.  I’m not forsaking my extra-large bowl of pho tai any time soon, but somehow, pho feels like hot-weather food to me.  On the other hand, the nutty miso, chunks of cabbage, asparagus, zucchini, carrot, broccoli stems, and generous chunks of salmon, all steeping in a dashi broth, banish the sub-freezing chill from my bones.  At just $4.50 for a generous bowl, it’s cheap enough to count as a snack.