Cauliflower, Beetroot & Celeriac Salad with Horseradish Cream

This is a great entrée for the winter months when celeriac and fresh horseradish are available. A good-quality purchased horseradish such as Tracklements brand may be substituted, of course, if the task of grating horseradish is too daunting. That said, if you have a fruit juice extractor, simply peel the fresh horseradish and put it through the extractor, then mix the grated pulp with the collected juice. Season this wit