Place chopped ribs in pressure cooker and brown evenly with oil. Season with salt and pepper.
Mix the following ingredients and pour over ribs. Make sure liquid mixture is almost covering ribs. If not add water to almost cover.
Close lid and cook for 15 minutes over medium heat after pressure cooker regulator starts to rock and releases a slow steady stream of steam. Remove from heat, release steam as per pressure cooker instructions and the sauce should have thickened.
Use a slotted spoon to remove ribs and pour sauce in bowls to dip or over tray of ribs to serve.