Defrost the blueberries.
Apple quarter, peel, core and cut into slices. Put them into a pot with the lemon juice and steam for about 2 minutes. Stir in 1 tablespoon of sugar. Add blueberries, toss briefly in the pot and let cool off.
Roast the almonds in a small pan without fat.
Mix mascarpone with yoghurt, the remaining sugar and vanilla sugar. Layer the mascarpone cream with blueberry and apple compote in glasses and sprinkle with almonds.