Prep the sauce: In a small bowl, combine 2 tsp brown sugar, 1 tsp sesame oil, 2 tsp rice vinegar, 1 tsp sriracha, 1/2 tbsp cornstarch, 2 fl oz water, 1/2 tsp ground pepper, 2 1/2 tbsp soy sauce, and 1 tsp oyster sauce. Whisk until well combined and set aside.

Set a large skillet over medium-high heat. Add 8 oz broccoli and 1 tbsp butter and cook for 3 minutes or until no longer pink. Stir occasionally as the meat is cooked. Transfer the veggie to a bowl and set aside.

Add 1 1/2 tbsp olive oil, 1 tbsp garlic, and 1 tsp ginger to the skillet. Stir for 30 seconds for fragrant.

Add 2 oz onion and cook for another 2 minutes.

Add 12 oz ground beef to the skillet and stir-fry for an additional 2 minutes.

Slowly pour the sauce into the skillet while stirring the meat. Stir occasionally and reduce the heat to simmer for 5 minutes, until the sauce thickens.

Stir in the stir-fried broccoli and cook to your desired tenderness, about 2 minutes. Remove from the heat.

Sprinkle 1/2 tbsp sesame seeds and 2 tbsp chopped scallion. Serve hot over rice.