Wash, halve and stone the plums. Then cut into slices. Bring the currant juice briefly to the boil. Steam plums for about 5 minutes. Flavour with sweetener. Mix starch with a little water.
Bind grits with it. Stir the yoghurt and a little cinnamon until smooth, then pour it onto the groats. Serve sprinkled with muesli. Decorate with mint as desired.