The amount of oxtail stew per person will depend on the size of the portion you are serving and how many people you are feeding.  Generally, a good rule of thumb is to allow at least one large piece of oxtail per person if you are serving small portions. For larger portions, allow 2-3 pieces of oxtail per person.  Make sure to adjust your recipe accordingly and check with guests beforehand if they have any dietary restrictions or food allergies to keep in mind when preparing your meal.