Peel and dice the potatoes. Boil in juice and water. This takes about 5 minutes in a pressure cooker and around 20-25 minutes in a normal saucepan, it depends a little on the size of the pieces. Finely mash or puree the potatoes and season with salt and pepper. Cut the beetroot into small pieces and mix in.
Place on plate and decorate with spring onion rolls. Serve immediately.
Makes a side dish for 2 hungry eaters or 3 small side dish portions.
Tip: You can also use the beetroot pickled with horseradish from the glass and use the brew as juice.