Radish Leaf Soup

Don't throw out those radish leaves, make this fantastic soup instead!  From epicurious.com

Radish Leaf Soup

1 tablespoon butter
1 large chopped onion
Leaves from 10-15 radishes, washed
5 medium potatoes (about 1.5 pounds), peeled and chopped into 1 inch pieces
3 cups of water or broth
2/3 cup milk

Melt butter in saucepan then add onions and saute until translucent.   Add radish leaves and saute until wilted.  Add potatoes and water.  Bring to a boil, then turn heat down and simmer until potatoes are tender, about 20 minutes.  Use an immersion blender to puree the soup.  Alternatively a blender can be used.  Season soup with salt and pepper to taste.  Garnish with a splash of cream (optional).