Adobo is a style of preparation, which in Philippine cuisine - is stewing in vinegar and soy sauce.
H eat oil then add peppercorn and bay leaves.
When the bay leaves start to turn brown, add the garlic. Saute until brown. Then add the onion and fry until translucent. Add the pepper and the sugar, stir briefly to mix, then add the soya sauce and vinegar. Lower heat to medium then add the potatoes or eggplant.