Heat oil in a wok or large skillet over medium-high heat. Add broccolini to the hot oil. Cook and stir until broccolini has softened and is green and glossy, 3 to 5 minutes.Advertisement
Add broth. Season with salt and sugar. Continue to cook until most of the broth has evaporated and broccolini is tender, about 5 minutes. Stir in soy sauce.
Chicken broth works really well and adds extra flavor if you are not vegetarian. You can also add garlic if you like before adding the broccolini.