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Cook noodles per package directions, set aside.
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Heat 1 tablespoon of oil in a large skillet.
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When the oil is nice and hot add in the steak (I had to do two batches to avoid overcrowding the pan, if you do this you will need a bit more oil). Sauté until browned on both side, 3-4 minutes. Remove from the pan and set aside.
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Add the remaining tablespoon of oil to the same pan.
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Add in garlic and ginger and cook for 1-2 minutes.
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In a small bowl combine soy sauce, mirin, brown sugar, sesame oil and fish sauce.
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Pour the soy sauce mixture into the pan and bring to a simmer and cook for 2-3 minutes.
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In a small bowl mix together the cornstarch and water.
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Slowly pour in the cornstarch mixture whisking continuously. Continue to cook until your desired thickness.
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Add steak and noodles to the pan and toss to coat with the sauce.
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Serve immediately with green onions and sesame seeds if desired.