Beetroot haters' soup

This is a delicious soup and very quick to make if you have some cooked beetroot to hand. If you don't, try it with the same quantity of finely grated raw beetroot.
Serves 4
Ingredients
2tbsp olive oil
1 onion, chopped
1 potato, peeled and diced
2.5cm piece of fresh ginger, grated or finely chopped
grated zest of 1 orange, plus extra to serve (optional)
juice of 2 oranges
3 medium beetroots, cooked
1.2 litres water [^1]
sea salt and freshly ground pepper
a little cream or yoghurt, to serve (optional)
Method
- Heat the oil in a large pan, add the onion and fry until soft but not coloured.
- Add the potato and ginger and fry for three minutes.
- Add the orange zest and juice, plus the beetroot and water*, then bring to the boil and simmer for 20 minutes, until the potato is tender.
- Blend until smooth.
- Reheat gently and season to taste.
- Serve garnished, if you like, with a swirl of cream or yoghurt and a little grated orange zest.
[^1]: This much water (1.2 litres) is too much unless you have 3 large beetroot. Try ½ litre first – then perhaps add a little more at simmer.