Make the sauce by combining all the ingredients in a small bowl.
Organize your vegetables in the order they will be cooked. In the first bowl, place the carrots and cauliflower, or other hard veggies that take the longest to cook. A second bowl should hold the cabbage, Chinese broccoli stems, snap peas, and mushrooms, or any other medium-firm veggies. A third bowl will have the Chinese broccoli leaves or any other leafy greens.
Place a wok on medium heat, then add the oil and garlic, and sauté until the smaller bits of garlic turn golden.
Add the hard veggies (bowl 1 ) and a splash of water, then turn the heat up to high and toss for 2 to 3 minutes, until the veggies are halfway done. Allow most of the water in the wok to dry up before adding the second set of vegetables.
Add the medium veggies (bowl 2 ), sauce, sugar, and pepper. Toss until the vegetables are cooked to your liking, 2 to 3 minutes.
Add the leafy greens (bowl 3 ) and toss just until wilted, about 15 seconds. Remove from the heat and serve with jasmine rice.