Cold Cucumber And Spinach Soup - cooking recipe

Ingredients

2 tablespoons unsalted butter (1/4 stick)
1 onion, coarsely chopped
1 large potato, peeled and coarsely chopped
1 leek, split, washed thoroughly and coarsely chopped (with 2 inches of green)
3 cups low sodium chicken broth
3 sprigs fresh parsley
salt & freshly ground black pepper
2 cucumbers, peeled, seeded and coarsely chopped
5 ounces spinach, blanched and chopped
1/2 cup sour cream or 1/2 cup light sour cream
1 tablespoon mayonnaise
1 teaspoon horseradish
2 lemons, juice of
1 dash hot pepper sauce
1 avocado (garnish)

Preparation

Melt butter in large saucepan over medium heat.
Add onion,potato and leek;reduce heat, cover and cook about 5 minutes.
Add chicken stock,parsley, salt and pepper and bring to a boil.
Reduce heat and simmer 20 minutes.
Let cool, then puree in blender until smooth; chill thoroughly.
Add remaining ingredients, except avacado and puree until smooth.
Chill; taste and adjust seasoning.
Just before serving,peel,seed and dice avocado and stir into soup.