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Easy
By Darina Allen
Published 1989
Put all the ingredients into a blender and run at medium speed for 1 minute approx., or mix oil and vinegar in a bowl, add mustard, salt, freshly-ground pepper and mashed garlic. Chop the parsley, spring onion and watercress finely and add in. Whisk before serving.
You will need a mild lettuce (e.g. the common b