Thai Pork Lettuce Wraps

Name: Thai Pork Lettuce Wraps
Ingredients: 1 pork tenderloin (about 1 pound), trimmed of silver skin and fat, cut into 1-inch chunks (see note); 2 1/2 tablespoons fish sauce; 1 tablespoon white rice (see note); 1/4 cup low-sodium chicken broth; 2 medium shallots , peeled and sliced into thin rings (about 1/2 cup); 3 tablespoons juice from 2 limes; 2 teaspoons sugar; 1/4 teaspoon red pepper flakes; 3 tablespoons roughly chopped fresh mint leaves; 3 tablespoons roughly chopped fresh cilantro leaves; 1 head Bibb lettuce , washed and dried, leaves separated and left whole