Moroccan Rice Salad

Ingredients

• 1/2 cup nonfat plain yogurt
• 1 tablespoon olive oil
• 2 teaspoons sugar, to taste
• 1 teaspoon curry powder, to taste
• 4 cups cooked basmati rice, cooled to room temperature
• 1/2 cup peeled and chopped tart apple
• 1/3 cup chopped green onion
• 2 tablespoons golden raisins
• 2 tablespoons snipped fresh chives
• salt, black pepper
• 3 cups torn leaf lettuce