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Heat most of the oil in a heavy-bottomed saucepan over a medium heat. Add the onion, garlic and ginger, cook slowly until the onion is translucent, then add the remaining curry paste and mix well. Cook your spices for a few mins, allowing the flavours to really open up. Decrease the heat, fold the potato into your mix, season well and cook for 5 mins.
Add the stock and simmer on a low heat until the potato is cooked, then lightly crush it. Add the chopped coriander, then remove from the heat and leave to cool. Chill in the fridge overnight.
The next day, heat the remaining oil in a frying pan. Season the lamb, brown it all over and cook until tender. Reheat the sauce, and add the lamb and any juices. Serve topped with coriander, with some wilted greens and fried red onion on the side.