1. Break digestive biscuits into fine crumbs.Rub with melted butter and spread evenly over cake pan and bake in preheated 180c oven for 10 mins.
2. Dissolve gelatine powder with a little water.
3. Beat margarine with electric beater until fluffy, add in yoghurt,milk and jam.
4. Pour in gelatine and stir well.
5. Place well combined mixture onto baked cake base, and place in refridgerator til set.
6. Beat egg whites till fluffy, add in sugar and beat well as cream. Use for decorating cake.