Milk Soup from the Ardennes

Description
As you probably know Belgium has as a second language French and part of it speaks primarily French. You can order this soup from most places in the country and even better is to make it yourself ! It's excellent and worth every minute of your time !

Ingredients

 * 2 tablespoons unsalted butter
 * 3 leeks, white parts only, rinsed well and sliced into thin rings
 * 1 large onion, coarsely chopped
 * 4 to 6 escarole leaves, coarsely chopped
 * 4 cups milk
 * 3 medium baking potatoes, peeled and cut into 1/2-inch cubes
 * salt and freshly ground black pepper to taste 2 tablespoons minced fresh parsley

Directions
1 Melt the butter in a heavy soup pot over medium heat. Add the leeks, onion, and escarole; cook, covered until the vegetables are softened but not browned, 5 to 10 minutes. 2 Add the milk and the potatoes, season with salt and pepper. Simmer, covered, until the potatoes are very soft and start to fall apart, about 30 minutes. You can serve this chunky soup as is-country style-or puree it in a blender or food processor for a more elegant presentation. 3 Serve hot, sprinkled with minced parsley.