For the blueberry layered dessert, select the most beautiful blueberries and set aside for decoration. Whisk the rest with half of the sugar and the juice of one lemon.
Mix yogurt, crème fraîche and remaining sugar until smooth. Mix half of it with half of the fruit puree.
Spread all three ingredients evenly in layers on top of each other in nice glasses, so that the dark, the mixed and white streaks sit nicely on top of each other.
Decorate the top (white) layer with fresh berries.