Cut the ribs into individual portions and set aside in a large bowl.
Sauce: Heat the oil in a saucepan over low heat. Add the garlic and ginger
and stir until aromatic, about 30 seconds. Add the sherry and reduce over high
heat for about 2 minutes. Add the remaining sauce ingredients and simmer for
about 20 minutes, stirring occasionally.
Arrange the spareribs in a large dish. Brush with generous amounts of the
sauce and refrigerate for 12 hours or overnight.
Heat oven to 400 degrees F.
Arrange the spareribs in a shallow baking pan and bake, brushing frequently
with the remaining sauce, until the ribs are well browned, crisp, and cooked
through, about 1 1/4 hours.