Medium heat a wok. When it gets warm, drizzle the oil and saute the grounded chicken along with garlic, salt and a little bit of the fish sauce.
When cooked, transfer it to a bowl.
In the bowl, combine the sautéed chicken with all the other ingredients in the respective order. First the dry ingredients: roasted rice powder, herbs, lemon grass, purple onion, ginger, chilli, and bean sprout.
Then, add the rest of the fish sauce and finally the lemon juice.
Mix well and serve it on a plate with green leaves.