1In a large skillet over medium heat, cook the ground pork until it is no longer pink, breaking it up into small pieces as it cooks.
Remove the skillet from heat and let the pork cool slightly.
In a large bowl, combine the lime juice, fish sauce, and sugar. Stir until the sugar is dissolved.
Add the cooked pork to the bowl and mix well to coat the pork with the dressing.
Stir in the chopped mint, cilantro, shallots, toasted rice powder, and finely chopped Thai chilies.
Taste and adjust the seasoning with more lime juice, fish sauce, or sugar if needed.
Serve the pork larb with the separated lettuce leaves. Use the lettuce leaves as wraps to eat the pork larb.