Begin by marinating the topped sirloin in a mixture of soy sauce, brown sugar, minced garlic, salt, and sesame seed oil.
Chop the garlic and add a generous amount to the marinade.
Prepare the vegetables by chopping the broccoli, bell pepper, onion, cabbage, and mushrooms.
For the sauce, combine equal parts of brown sugar, soy sauce, and water, then stir in a quarter cup of sesame seed oil and some minced garlic.
In a hot pan, cook the bell peppers and onions for about 7 minutes.
Next, add the remaining vegetables and continue to cook for an additional 5 minutes.
Rinse the soba noodles under warm water to separate them before adding them to the stir fry.
Once the vegetables are nearly cooked, pour in a cup of the prepared sauce.
Cook the marinated meat last, ensuring the pan is very hot for proper caramelization.
After the meat is cooked, place it on top of the noodles and vegetables, then mix everything together.
