Wash the young nettle tops in several changes of cold water, Wearing Rubber Gloves!!!! Chop finely, or mince. Melt butter in pot. Sprinkle in oatmeal and fry until golden brown. Stir in water, stock or milk. Bring to the boil, stirring constantly. Add the nettles, salt and pepper. Bring to the boil. Lower heat and simmer for 30 to 45 minutes.