https://www.simplyrecipes.com/ground-beef-and-broccoli-stir-fry-recipe-8601830
Ingredients
1 cup water
6 tablespoons lower-sodium soy sauce
3 tablespoons packed light brown sugar
1 tablespoon cornstarch
3 cloves garlic, minced
1 tablespoon minced fresh ginger (from 1-inch piece)
2 teaspoons unseasoned rice vinegar
3 tablespoons neutral oil (such as canola), divided
12 ounces (about 5 1/4 cups) fresh broccoli florets
1 pound 90/10 lean ground beef 
1/2 teaspoon kosher salt
2 teaspoons toasted sesame seeds (optional)
2 green onions, thinly sliced (optional)
Steamed white rice, for serving