Pear and Roquefort salad

Ingredients

• 1 stalk celery
• 3 ripe pears ((preferably red or pink-flushed))
• 1 head Belgian endive (separated into leaves)
• 50 g lamb's lettuce or baby salad greens
• 1/4 cup pecans or walnuts (lightly toasted)
• 90 g Roquefort cheese
• 4 slices pumpernickel or walnut bread (toasted)
• 2 tbsp walnut oil
• 1 tbsp sherry or balsamic vinegar
• 1 tsp Dijon mustard
• 1 tsp honey
• 2 tsp poppy seeds