1 1/2 lb. ground pork
1/4 cup fish sauce
3 garlic cloves, minced
1 Tbsp. plus 1/2 tsp. light brown sugar
1/4 cup lime juice plus 1/2 tsp. zest from 2 limes, plus more wedges for serving
1 1/2 tsp. seeded and minced red chili pepper (such as fresno), plus more, sliced, for serving
1 Tbsp. vegetable oil
1/2 small red onion, sliced thin
2/3 cup chopped fresh basil, plus more for serving
2/3 cup chopped fresh cilantro, plus more for serving
1/3 cup chopped fresh mint, plus more for serving
1/4 cup chopped honey-roasted peanuts (optional)
1 large head butter or bibb lettuce, separated into leaves for serving
4 oz. thin rice noodles, cooked according to package instructions