How to Make It
In a mini food processor, combine the anchovies with the vinegar, mayonnaise, Worcestershire sauce, garlic and pepper; process until finely chopped. With the machine on, add the olive oil in a steady stream. Add the cheese and pulse just until combined.
In a bowl, toss the lettuce, onion and croutons with half of the dressing. Add the remaining dressing, toss well and serve.