Apple & cinnamon sundaes

Preparation time: 10 mins Ingredients 3 apples, chopped 2 tablespoons lemon juice 1/3 cup raisins 8 ginger biscuits, crushed 1/3 cup chopped walnuts, toasted 2 cups low-fat thick vanilla yogurt 1/4 teaspoon ground cinnamon Sliced apple, to decorate