Serves 20

For the dressing

1 litre good-quality mayonnaise
10 cloves garlic, peeled and crushed
25-30 anchovy fillets, drained and chopped
The juice of two lemons

To serve

About 100ml olive oil, mixed with 100ml vegetable oil
6 garlic cloves, halved
10 x 1-2cm thick slices of white bread, crust removed and cut into rough 1-2cm cubes
Salt and pepper
100-120g freshly grated Parmesan
4-5 large, firm, crisp cos or romaine lettuces, washed and dried

Mix all the ingredients for the dressing; dilute with a little water to make it a thick pouring consistency. To make the croutons: heat the oils with the halved garlic cloves. Fry the bread cubes until they are golden, then drain them on kitchen paper. Season, and sprinkle with a little of the Parmesan while they are still warm. Tear the lettuce into pieces and put in a bowl. Toss it with the dressing and the rest of the Parmesan. Scatter croutons on top and serve immediately.