Caramelized pear, radicchio, and blue cheese salad

Ingredients

• 6 pears
• 1 head radicchio
• 1 head red leaf lettuce
• 5 1/3 oz blue cheese
• 1/2 stick unsalted butter
• 1 tbsp sugar
• 120 g walnuts
• 1 lemon
• 3 tsp Dijon mustard
• 3 tsp honey
• 1/3 cup olive oil
• 2 tsp poppy seeds
• salt
• pepper