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Mix the beef with salt and soy sauce.
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Marinate in the fridge for 1 hour.
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While the beef is marinating, boil the potatoes until soft.
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When potatoes are cooked, peel and dice them.
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Set aside.
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Take the beef out of the fridge and mix.
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Heat sesame oil into a pan or a wok.
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Lightly brown onions (about 1 minute).
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Add Beef and Potatoes.
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Mix.
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Keep stir frying until the beef is cooked.