Preheat your oven to 450°F (232°C) and line a baking sheet with parchment paper.

In a large bowl, combine ground beef, green onions, ginger, and garlic. Season with salt and pepper, then form into meatballs and place on one half of the baking sheet.

On the other half, place broccoli, drizzle with olive oil, and sprinkle with salt and pepper. Toss and arrange in a single layer.

Bake for about 15 minutes until the meatballs are cooked and the broccoli is tender.

In a skillet over medium-high heat, combine vegetable oil, soy sauce, brown sugar, garlic, ginger, water, and vinegar. Cook for about 10 minutes until thickened.

Mix cornstarch with water and add to sauce, stirring until it thickens.

Combine cooked meatballs with the sauce, tossing to coat.

Serve the meatballs and broccoli over rice or noodles, garnishing with green onions and sesame seeds.