Pork and Lemongrass Meatballs in Lettuce Cups

Name: Pork and Lemongrass Meatballs in Lettuce Cups
Ingredients: 1 pound ground pork; 1 lemongrass stalk, bottom 5 inches only, smashed with rolling pin, then minced; 1/4 cup chopped shallots; 2 tablespoons chopped fresh cilantro; 2 tablespoons fish sauce (such as nam pla or nuoc nam); 2 garlic cloves, chopped; 1 tablespoon vegetable oil; 1 teaspoon sugar; 1/2 teaspoon ground white pepper; 1 lemongrass stalk; 1/4 cup fresh lime juice; 1/4 cup fish sauce; 2 tablespoons coarsely grated carrot; 4 teaspoons (packed) golden brown sugar; 2 teaspoons minced green Thai chile or serrano chile with seeds; 2 tablespoons vegetable oil; 1 head of butter lettuce, leaves separated; 1 small persian cucumber, thinly sliced; Ingredient info: Fish sauce can be found in the Asian foods section of many supermarkets.