Heat oil in a frying pan for few minutes and keep the flame on medium heat. After the oil is hot enough, lower down the flame and start adding the chopped onions, ginger, egg plant, garlic and mo qua, and stir fry for a while.
After the veggies are a little fried, start adding some more ingredients including leeks, the tomatoes that you have just chopped along with the chicken stock that you have already prepared. As you fry, season with salt and sugar to taste.
After about half a minute take it out in a serving platter. Sprinkle coriander leaves and serve hot along with rice or pita bread.