1 head radicchio leaves, separated and washed
1 head cos lettuce, washed
1 bunch of lamb's lettuce, or watercress, washed
120 g (4 oz) cherry tomatoes, halved and cored
4 chicken breasts, cooked, skinned and thinly sliced
120 g (4 oz) Bresse bleu, or other blue cheese, cut into small pieces
16 small pickled gherkins, thinly sliced
60 g (2 oz) walnut halves
2 tbsps each vegetable and walnut oil, mixed
2 tsps white wine vinegar
180 ml (6 fl oz) fromage frais
2 tsps chopped fresh tarragon leaves
Salt and pepper