Heat oil. Then add onion. Let the onion cook. You can tell if it turns transparent.
Add diced pork and let it brown in the cooking oil. When the pork turns brown in all sides,, add water and let it boil for another 5 minutes.
When the meat is cook. add the asparagus and let the asparagus turn lighter green. Do not overcook the asparagus. It is not good when it is not crunchy.
Add bell pepper.
Add oyster sauce.
Let it simmer for one last time .
Serve and Enjoy.