Heat oil in a large skillet on medium heat. Cook the onions, peppers and broccoli for 5 minutes. Take out of the pan.
Season ground beef with salt and pepper and continue cooking for 5 minutes. Drain the fat and add vegetables to the skillet.
Mix soy sauce, brown sugar and apple cider vinegar together.
Bring water to boil in a large saucepan. Cook the ramen noodles until tender (2 minutes) Drain.
Put cooked ramen noodles in a skillet. Pour sauce over. Mix until well combined. Season with salt and pepper to taste. Garnish with scallions, and then serve.