Cut the butcher prepared slabs into individual ribs.
In the wok, heat oil and saute spareribs until lightly browned. It will take 10-15 minutes and not many will actually brown. It's ok.
Add soy sauce, sherry, ginger, garlic and water. Use enough water just to barely cover. Bring to a simmer. Cover and cook for 20-30 minutes.
To Finish: Add bean sauce and brown sugar. Cook uncovered, stirring occasionally, until liquid is reduced to a glaze.