Many of us are familiar with the prepared horseradish that you buy in jars at the supermarket. But this month we want to get down to the very root (see what we did there?) of this popular, pungent ingredient. Fresh horseradish might not look like much - picture a gnarly parsnip - but this base ingredient can be used to add fire and punch to numerous recipes. November is prime time for picking horseradish as its best after the first frosts when the leaves turn brown and start to die back.