Step 1

In a large bowl, toss the steak with 2 tablespoons of cornstarch, vinegar, and 1 tablespoon of soy sauce. Set aside.

Step 2

Meanwhile, melt your butter or oil in a large skillet over medium-high heat.

Step 3

Add your steak strips in a single layer for a minute or so per side until browned. You may need to do this in batches.

Step 4

Remove the steak from the pan and set aside.

Step 5

Put the broccoli and water in a microwave-safe bowl. Top with a damp paper towel and microwave for 5 minutes.

Step 6

Drain off the water and set broccoli aside.

Step 7

Remove any remaining butter or oil from the pan.

Step 8

Add the remaining soy sauce, beef broth, brown sugar, garlic, and remaining cornstarch to the pan.

Step 9

Whisk over medium-high heat until slightly thickened.

Step 10

Add the beef and broccoli to the sauce and toss to coat.