In a large mixing bowl, mix together the salt, eggs, corn starch, ginger, and spring onion. Add the pork and using a large sturdy spoon, stir the pork in one direction until it absorbs the liquids and is sticky. This takes several minutes of stirring. Then add the water chestnut if using and mix that in as well.
Pour about 4 cups of cooking oil into a medium sized deep pot and heat it to just before smoking then reduce heat to medium.
While the oil is heating, form the meatballs, about 8 meatballs is the goal to achieve, form each ball about 2 or so inches in diameter. Squeeze together for a firm meatball.
When the oil is hot, carefully using a slotted spoon, lower one meatball into the pot and cook for 2-3 minutes or until the meatballs are just starting to get browned, remove and set aside, continue cooking all remaining meatballs.
Prepare another pot and add the Braising ingredients then add the meatballs and heat on a simmer for 20 minutes, if the liquid does cover the meatballs, use a spoon and scoop and pour the liquid from time to time over the meatballs.
Lay some lettuce leaves in two serving bowls and divide the meatballs between the bowls, serve.