Oil a wok and add the seeds oil. Heat and add leek and ginger finely minced. Let it brown a few minutes. Add vegetables and mushrooms cut into strips, add sesame oil and stir well with a wooden spoon. Simmer with medium heat and add 2 cups of mushrooms water.
You can add almost any veggies you want in this dish, you are not really limited but this is how It is served most often, I like to add carrots too. It is so fast and easy, and figure friendly too!