In the original dish the aim was to pick up individual leaves with your fingers and eat them. I kept my lettuce leaves whole, but I did use a knife and fork. You can use a small food blender to make a smoother dressing, but I was happy with a rustic finish from just using a fork.
Preheat your oven to 350 F / 180 C / Gas Mark 4. Place the baguette slices on a baking sheet and drizzle with the olive oil. Season with the garlic salt and bake for twenty minutes until golden brown. Remove from the oven and allow to cool.
Place the anchovies, garlic, Dijon mustard and half of the grated Parmesan into a bowl and mash into a paste with the back of a fork. Add the mayonnaise, lemon juice and the Worcestershire sauce and mix thoroughly.
Add a couple of spoons of oil from the anchovies to let the dressing down and mix again. Check the seasoning, it will probably not need salt but add a good grate of pepper and mix again.
Toss the prepared Romaine lettuce in the dressing and serve with the croutons and the remaining grated Parmesan.