Wash the strawberries, prepare and cut in half or even into quarters. Put in a bowl, sprinkle with powdered sugar and pour the orange liqueur over it. Mix carefully and let stand a little.
Peel and slice the bananas, place in a bowl, add the lemon juice, yogurt, vanilla sugar and sugar. Then puree the whole thing with the hand blender.
Divide the banana foam into 4 deep plates and place the marinated strawberries on top.