Turkey and Fruit Salad

Ingredients

• 1 small head iceberg lettuce
• 1 head treviso or round radicchio
• 1 small cantaloupe or honeydew melon (about 500 g/1 lb)
• 250 g (8 oz) red seedless grapes
• 250 g (8 oz) green seedless grapes
• 1 tbsp butter
• 500 g (1 lb) turkey tenderloins or turkey breast cutlets, cut into thin strips
• Salt and freshly ground black pepper
• 1 tbsp fresh lemon thyme leaves
• 1/4 cup (25 g/1 oz) walnuts
• 2 tbsp crème fraîche or sour cream
• 2 tbsp walnut oil
• 3 tbsp lemon juice