Wash and remove the stems from the spinach or kale, if necessary.
Combine the broth, soy sauce, sugar, cornstarch and sesame oil in a small bowl. Taste and if needed add salt. I only add salt if I use low sodium broth and soy sauce. If either have salt I don't generally add any.
Heat the vegetable oil in a skillet over medium heat until it shimmers or when a drop of water flicked in it dances.
Add the garlic and stir. If garlic starts to brown you need to reduce your heat.
Quickly stir the soy mixture to make sure the cornstarch is totally dissolved. Add to the garlic in the skillet.
Simmer for a few minutes until mixture thickens.
Increase the heat, add the spinach and cook.
Stir, with a wooden spoon, until starting to wilt and totally coated in soy mixture, about a minute.
When serving, serve with a slotted spoon to reduce juices or serve juices on top of rice.
Enjoy!