Add the onion and saute briefly. Add the pork, garlic, ginger, scallions, lemon juice, fish sauce, and red pepper flakes. Toss to combine and cook for 2 minutes.
Move the mixture to the sides of the wok and add the soy sauce and arrowroot into the center of the wok.. Whisk to combine.
Add the mint, cilantro, and peanuts, tossing the entire mixture together. Spoon the mixture into the lettuce leaves and roll up like an egg roll.
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