Heat the oil in a non stick pan. Add the mustard seeds and when they splutter, add the red chilli, split Bengal gram and green chillies and sauté for a minute. Add the cashewnuts and curry leaves and sauté for a minute. Add the turmeric powder and asafoetida and mix well. Add the boiled rice and mix well. Add salt and quarter cup of water. Stir well, cover and cook for two minutes on medium heat. Sprinkle lemon juice and mix well. Serve hot.