Reduce the heat to medium and add the cooked noodles. Stir for 1 minute.
Add the cooked beef and pour in the sauce. Stir for 2-3 minutes until the sauce thickens.
Turn off the heat and add 1 tsp of toasted sesame oil. Give it a final mix.
Serve the lo mein on a plate and sprinkle green onions on top. Enjoy!
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