Mix all the curry paste ingredients together into a paste.
Cook lentils in boiling water for 15 minutes. Chop onion and cook in a little oil for few minutes until softened and beginning to brown.
Add chopped garlic, curry paste and cubed potatoes, cook for 5 minutes. Drain lentils and add to potato mix along with stock. Cook for 15 mins until potatoes are soft. Blend until smooth. Season to taste.