First, immerse the watercress for about 15 minutes in salt water in a big pot. Rinse twice and then let them dry.
Rinse away the grease from the outer surface of the tofu puff with boiling water. Dry them up and cut a small hole in each tofu puff.
Peel and crush the garlic.
Wash black beans and strain.
Mix and crush the garlic, black bean, bean paste, sesame oil and oyster sauce in the bowl using a spoon.
Remove the shell of quail eggs. Put each egg in each tofu puff and add the shrimp paste on top.
Add 2 tbsp of oil and the watercress in the wok. Add a bit of salt and fry the watercress until cooked. Put them on the dish.
Using the same wok, add 1 tbsp of oil and fry garlic mix with low heat. Add a cup of hot water and tofu puff (with stuff inside). Add 1 tsp of cornstarch and cover the lid with medium heat for about 3 minutes.
Finally, put tofu puffs and liquid on the top of the watercress. Serve.