Braised Lettuce Soup
   From The Thorough Good Cook; recipes from 1896.
   http://www.eatdangerously.com/thorough_cook/soups/braised_lettuce_soup.html

Cream of Lettuce Soup
   A fast, simple recipe.
   http://www.foodfunandfacts.com/creamoflettucesoup.htm

Green Soup
   A full soup using lettuce, spinach and watercress.
   http://www.cs.cmu.edu/People/mjw/recipes/soup/green-soup.html

Lettuce And Courgette Soup
   A recipe serving four.
   http://fooddownunder.com/cgi-bin/recipe.cgi?r=88238

Lettuce Soup
   Recipe from Abbeydale House Bed and Breakfast, Surrey, British Columbia, Canada.
   http://www.virtualcities.com/ons/bc/w/bcw77012.htm

Zuppa D' Erbe - Lettuce Soup
   A basic, simple recipe.
   http://www.worldwideschool.org/library/books/tech/recipes/soup/Zuppad'Erbe/Chap0.html