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600 g/1 lb 5 oz potatoes (I recommend Maris Piper)
- Bring a pan of water to the boil. Peel and dice the potatoes. Remove the thick stems and finely chop the cavolo nero/kale (if using).
- Add the potatoes to the boiling water and simmer on a medium heat for about 15 minutes until very soft. Drain but retain the water.
- Return the potatoes to the pan and add in 1–2 tablespoons of the potato water. This hel