Parsley is not just for garnish.
This herb is an anticarcinogen that is also useful as a digestive aid and helps to purify the blood. It contains three times as much vitamin C as oranges, and twice as much iron as spinach. Parsley contains vitamin A and is a good source of copper and manganese.
I read somewhere it is added to a plate so that eaters have a natural breath freshener at the end of a meal.