In a small bowl, combine hot boiled water, Beef Better Than Bouillon, and brown sugar. Stir well until dissolved. Add soy sauce and set aside.

Dice the carrots, broccoli, and onion into two-inch pieces. Slice the beef into thin strips.

Heat a skillet over high heat and add sesame oil. Cook beef strips until golden brown, about 3-5 minutes. Remove and set aside.

In the same skillet, sauté onions until golden brown, about 4-5 minutes. Remove and set aside.

Sauté carrots until they start to soften, about 4 minutes. Add broccoli and cook for an additional 3 minutes until crisp-tender. Return onions to the pan.

Press garlic into the vegetable mixture and stir. Add the cooked beef back into the skillet.

Pour the prepared sauce over the beef and vegetables. Let it simmer for about 2 minutes.

Add the cooked lo mein noodles and toss together thoroughly.

Transfer to a large serving dish. Serve immediately while hot.