Pear, radish and fennel salad

Ingredients

• 3 tbsp lemon juice
• 1 1/2 tsp lemon zest
• 1 tsp Dijon mustard
• 1/2 tsp salt
• 5 tbsp olive oil
• 1 head Boston or butter lettuce , leaves separated
• 1 small fennel bulb , halved
• 2 Anjou or Bosc pears , stems removed, halved and cored
• 1 cup radishes , (about 9 radishes)
• 1/4 cup chopped toasted pecans