1. Cut the fibrous ends of lemongrass, keeping the most tender part in the middle, slice then mince; finely mince Thai coriander; tear off the vein of the kaffir lime leaves, roll them up, slice and then mince. Mix all the herbs, set aside.
2. Mince small chilli pepper and shallot.
3. Rinse Chinese lettuce, trim the leaves to make lettuce cups, soak in ice water, set aside.
4. Heat little oil in a skillet, sauté minced shallot, then stir in vegetarian minced meat until it starts to form crumbs, add the herbs, stir well, add a little chilli powder, vegetarian fish sauce and sugar, stir well and transfer to a plate.
5. Drain the lettuce cups, place on a plate, scoop the vegetarian minced meat into the lettuce cups, garnish with minced chilli and Thai broken rice, drizzle lime juice and serve.