Crunchy Waldorf salad

Delicious, healthy, crunchy and simple to make. What more could you want from a salad?

Ingredients:

• 6 sticks of celery
• 1 Royal Gala apple
• 1 small bunch of crimson grapes
• ¼ cup walnuts
• 1 cos lettuce
• 1 lemon
• 1 tablespoon extra virgin olive oil
• 3 tablespoons Greek yoghurt
• Pinch of salt
• Pinch of pepper