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Combine all sauce ingredients together in a bowl and set aside.
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Heat up wok over medium heat, then add pork belly. Cook pork belly until it’s white, about 5 minutes. (Depending on how fatty your pork is, you may want to pour out some of the excess fat before you add the other ingredients.)
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Add onion and green onions to the wok and stir fry for 2-3 minutes.
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Lastly, add the sauce to the wok and toss until the pork belly mixture is well coated. Let cook for another 2 minutes.
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Remove the wok from heat and serve pork belly with the butter lettuce leaves.