To make dressing, combine lime and lemon juices, fish sauce, honey, chili sauce, and -- if using -- either lemon zest or lemongrass puree. Whisk to combine.
Chop onion, shallots, hot pepper and -- if using -- mince fresh lemongrass bulb. Sautee in coconut oil for 3-5 minutes until softened and translucent. Add ground pork and sautee until no pink remains, breaking up well as it cooks.
Stir in dressing and simmer over low-medium heat 3-5 minutes to combine flavors. Off heat, stir in chopped fresh herbs.
Serve meat piled on fresh lettuce leaves for scooping and wrapping.