Simmer the adobo uncovered for a bit longer to reduce the liquid. This helps to concentrate the flavors and thicken the sauce naturally.You can mix a tablespoon of cornstarch or flour with a bit of water to make a slurry and stir it into the simmering sauce. Let it cook for a few more minutes until it thickens.Stir in a small amount of mashed potatoes or potato starch to thicken the sauce. Just be sure to mix it well to avoid lumps.Adding a bit more soy sauce or vinegar can enhance the flavor while helping to thicken the sauce slightly. Be careful not to overpower the dish with too much.Adding a bit of tomato paste or ketchup can also help thicken the sauce and add a nice depth of flavor.If you want to avoid thinning out the sauce, make sure to simmer with the lid off to let some of the liquid evaporate and thicken the sauce.