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

Dice the carrots, broccoli, and onion into roughly 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 beef and set aside.

Sauté diced onions in the same skillet until golden brown, about 4-5 minutes. Remove onions and set aside.

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

Press garlic cloves into the vegetable mixture and stir. Return cooked beef to the skillet.

Pour the prepared sauce over the beef and vegetables. Simmer for about 2 minutes.

Add cooked lo mein noodles to the skillet and toss to coat with the sauce and combine with beef and veggies.

Transfer lo mein to a large serving dish and toss gently. Serve immediately.