Place the egg in a pan of cold water and bring to the boil. Boil for one minute and then plunge into cold water to stop the cooking process.
Once the egg is cool enough to handle, crack the egg into a food processor and add the garlic, lime juice, Worcestershire sauce, anchovies and oil. Process well and add pepper to taste.
Fry the bread cubes in a little olive oil until crispy, then drain on kitchen paper. Place the cos lettuce in a bowl.
To serve, pour the dressing over the leaves and add the croutons and parmesan. Toss well and serve at once.
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