Roast the oat flakes in a pan without fat until golden brown. Wash, halve and stone the plums. Bring juice and plums to the boil briefly. Season with lemon juice, cinnamon, sugar and aniseed.
Stir starch and 1 tablespoon of cold water until smooth. Add to the plums while stirring carefully and bring to the boil again. For the pancakes, mix egg, flour, mineral water and baking powder. Fry 2 small pancakes in a pan spread with oil, turning them golden brown.
Fill with the compote and sprinkle with oat flakes. Serve garnished with mint.