Wash the lentils, beans and sweetcorn in a sieve one after the other and drain. Remove the seeds from the peppers and chillies and cut into small cubes. Peel and finely dice the onion and garlic. Heat the oil in a large pan and sauté the onion. Add the diced garlic, peppers and chillies and sauté together for 3 minutes. Add the lentils and tomato purée, mix well and sauté. Pour in the vegetable soup. Add the chopped tomatoes, tomato purée, beans and sweetcorn. Season with paprika powder, cumin, salt, cayenne pepper, sugar and chilli powder. Mix well and simmer with the lid half open for 15 minutes. Stir occasionally. Finally, season to taste.