Pear chicory blue cheese salad

Name: Pear, chicory & blue cheese salad
Ingredients: 4 small heads chicory (we used a mix of red and pale green); 2 ripe but firm pears, quartered and cored; juice 1 lemon; handful flat-leaf parsley, chopped; 50g walnut halves; 2 tbsp walnut oil; 100g blue cheese (Stichelton, Stilton or Barkham Blue all work well) or vegetarian alternative