Place the curry sauce ingredients into a food processor and blend until a rough paste has formed. Set it aside.
Drizzle your oil into a pan and place on a medium heat. Drop in your onion, garlic, and ginger, fry for 5 minutes. Transfer all of your spices, salt, and sugar into the pan and fry for a further 5 minutes.
Meanwhile, boil your cubed potatoes for 10 minutes or until cooked. Drain them and set them aside.
Pour your curry sauce into the onion and spice pan and stir well. Transfer your boiled potatoes and two extra handfuls of spinach into the pan and simmer for a further 5 minutes. Taste the curry and add in any extra seasonings or spices if you need an extra kick!
Serve up with some naan, rice, or just on its own and enjoy!