You can stir fry (http://chinesefood.about.com/od/vegetablesrecipes/r/fried_lettuce.htm) it, you can just fry it (http://www.cdkitchen.com/recipes/recs/67/Fried_Lettuce52739.shtml), or you can use it as a wrap (http://www.cookiemag.com/food/2008/04/tasting_school).
You can also, apparently, stew it (http://recipes.lovetoknow.com/wiki/Stewed_Lettuce_Recipe_2). (This one came as a surprise to me, too.) If it's a crisp lettuce, you can stuff it (http://www.recipezaar.com/108868). And here are three recipes for Cream (http://fooddownunder.com/cgi-bin/recipe.cgi?r=79999) of (http://fooddownunder.com/cgi-bin/recipe.cgi?r=79998) Lettuce (http://fooddownunder.com/cgi-bin/recipe.cgi?r=79997) Soup.
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You can also, apparently, stew it (http://recipes.lovetoknow.com/wiki/Stewed_Lettuce_Recipe_2). (This one came as a surprise to me, too.) If it's a crisp lettuce, you can stuff it (http://www.recipezaar.com/108868). And here are three recipes for Cream (http://fooddownunder.com/cgi-bin/recipe.cgi?r=79999) of (http://fooddownunder.com/cgi-bin/recipe.cgi?r=79998) Lettuce (http://fooddownunder.com/cgi-bin/recipe.cgi?r=79997) Soup.
I hope this helps.