In Vietnam I had several dishes, which combine lemongrass with pork. It is a lovely combination.

For 500 gram pork belly you need about:

5 garlic cloves, minced
3 shallots, minced
1 - 2 tablespoon fish sauce
1 1/2 teaspoons granulated sugar
1/4 teaspoon black pepper
5-6 lemongrass stalks

Marinate the meat with the finely chopped garlic, shallot, black pepper, fish sauce and sugar.

Fry the meat for 15 minutes. Add the thinly sliced lemongrass and fry until done.

Below a different version with fresh lemongrass and an assortiment of meats.

I saw a different version in which you braise the pork belly in a little water with soy sauce. If the meat is half done add sliced onion, lemon grass, seasoning powder, a little sugar, oyster sauce, dried chili and kaffir leaves.