Beetroot chutney

Have a look round your allotment site -- lots have it growing semi wild, not in anyone's plot 

and the verge of the plot opposite me 

Learn to identify it correctly by it's leaves and you will notice it growing everywhere.

I see it all the time growing along road sides field corners and down public footpaths.

If you can't find any horseradish, I've made a lovely combination of pickled beetroot and mooli (Japanese radish) - obviously the mooli isn't as hot as horseradish, but it stays crunchy and gives a nice peppery contrast to the softer, sweeter beetroot.  The best way to prepare the beetroot is to bake it to retain the flavour and colour, and then peel it after it's cooked before proceeding with the pickling in the usual way.