Heat oil in a pan add mustard seeds. When it pops add the urad dhal and fry until golden. Add ginger, garlic and fry for few minutes. Then add the chopped onions and fry until it is translucent. Add the chopped tomatoes and mix well. Then put the okra and fry for few minutes. Add red chili powder, turmeric powder and salt. Mix well and pour little water. Lower the heat and cook until the okra is done and the gravy becomes thick. Sprinkle with lime juice. Garnish with chopped cilantro leaves.