Soak the vegetables in a tub of cold water with 2 teaspoons salt for 3-5 minutes. Run water in between the leaves and the stem to get rid of any dirt. Rinse well. Remove any flowers. Trim the bottoms.

Add salt and oil to a medium pot of water. Bring it to a boil on high heat.

Once the water is boiling, add vegetables. Cook for 1 minute.

Drain and serve with oyster sauce on the side.