Cook and stir onion in butter in a 3 quart saucepan over low heat until tender. Reserve 1 cup lettuce, stir remaining lettuce into onion, cover and cook over low heat until lettuce wilts, about 5 minutes. Stir in flour and cook and stir 1 minute. Add water and bouillon and hat to boiling, stirring constantly. Boil and stir 1 minute. Pour mixture into blender or food processor container. Cover and blend on high speed until smooth, about 30 seconds. Pour into saucepan and stir in reserved lettuce, half-and-half, salt and pepper. Heat just to boiling. Garnish with mint or parsley.
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