Cook the lentils over medium-high heat for 15 minutes, drain and set aside.
Heat the oil over medium heat and sauté the onion for 4-5 minutes or until it softened.
Add the carrot and cook for 2-3 minutes.
Add the potatoes and sauté for another 4-5 minutes
Add the lentils, tomato paste, salt, black pepper, chili flakes and cook for another 4-5 minutes, stirring occasionally.
Add 1-litre water and cook over low heat for 25-30 minutes or until lentils are soft and tender.