Whip soya too about 2 minutes with sugar until firm. Add soy yogurt and 1/4 cup of any flavoring you choose and whip 1 more minute. Layer into glass jars and place in freezer (or outside if you live where it's frigid) for two minutes until firm. If you don't want to eat it immediately, or are from somewhere warm, chill in the fridge for 30 minutes or more.