Place the potatoes in a saucepan of boiling water and simmer for 20 minutes. Drain, return to the pan over a low heat and, shaking the pan, allow the excess moisture to steam off. Mash the potatoes until smooth.
Cook the spinach in a large pan over a medium heat with no added moisture, mixing constantly until wilted and soft. When cooked, place in a clean kitchen cloth. Gather the corne