Pour in the chicken or vegetable stock, stirring to combine. Bring to a simmer.
Slowly add in the coconut milk, followed by the soy sauce and sugar, and stir until smooth. If using, add the kaffir lime leaves.
Carefully place the frozen dumplings into the simmering sauce, ensuring they are submerged but not overcrowded. Cover with a lid and steam for about 12 minutes.
Once cooked, remove the lid and stir in torn Thai basil leaves before serving.