In a medium size pan: bring the water to a boil. Then, add broccoli florets and blanch for 1-2 minutes. Over the sink: drain the broccoli using a strainer. Place the broccoli in a bowl and set aside.
Using the same pan (wipe with a paper towel and make sure it is completely dry), add oil. Wait for 30-60 seconds.
Add minced garlic and cook for 30 seconds or until fragrant.
Add the marinated shrimp and cook each side for 2-3 minutes or until no longer raw.
In a small bowl: combine cornstarch with the water; mix until fully liquifies.
Add the chicken broth, sugar and liquid cornstarch to the sauce pan; mix well.
Add the cooked broccoli florets; mix well.
Season with salt and white pepper to taste; mix.