Gently separate the leaves from the core, then rinse and dry them with a clean tea towel.
Toast the bread, then rub them with the garlic. When cool, cut them into small croutons.
Using a pestle and mortar, make a paste from the anchovies, garlic and mustard. Mix with the yoghurt, then season with salt &pepper. Taste and add some lemon juice to your liking.
Arrange the salad leaves in a serving bowl, add the anchovy slices, then scatter the croutons on top. Pour over the dressing and sprinkle with a little Parmesan.