Peel apples, cut into quarters, cut out core. Clean carrots and celery. Cut everything into strips and sprinkle with lemon. Mix with the nuts. Whisk yogurt, add sugar, salt and a pinch of white pepper. Spread evenly over the lettuce.
Preparation: about 30 min.
About 181 calories/757 joules.
Tip: Use regular or light yogurt as needed!