Pear and Blue Cheese Salad

Ingredients

• 2 pears, halved, cored and thinly sliced
• 3⁄4 cup (185 ml/6 1⁄2 fl oz) buttermilk
• 1 tablespoon white wine vinegar
• salt and freshly ground black pepper
• 2 tablespoons chives, cut into short pieces
• 1 head butter (butterhead) lettuce
• 1 head radicchio or other red lettuce
• 2 cups (75 g/3 oz) watercress leaves
• 1 small cucumber, thinly sliced
• 2 tablespoons crumbled blue cheese