Yesterday's frigid temperature inspired me to meet Plum at the school gate with hot soup in hand - an afternoon snack.  She ate it all by the rapid happy spoonful.  Proud mommy moment!  So begins a week of nourishing soup recipes - a break from the weather in the form of a cup or bowl.    We start with Borscht.  This velvet puree radiates both warmth and goodness - grown up baby food at its best.  Technically Borscht can be many things - from a beefy stew to a vegan broth.  We split the difference - using a strong stock and seasoning with fresh horseradish because not only is the root KR's favorite - it clears the sinuses like no one's business.