Soaked gelatin in cold water until they were swollen. Then in a water bath or half power in the microwave melting it. Wait a little to cool and add to yogurt, to which we have added sugar. Stir. Zest of 1 lemon and wring the juice of half a lemon and together with them the walnuts add to milk. Grated apple, half broken biscuits and also add them to the mixture. Intersperse them in suitable containers (small bowls or cups), as top put on a biscuit. Let cool to tight. Before serving dip bowls or cups in hot water and turn in the saucer. Top can be arranged with a slice of apple or just any fruit.