Blueberry frozen yoghurt cheesecake

Name: Blueberry frozen yoghurt cheesecake
Prep time: 20 min
Cook time: 14 h 55 min
Total time: 14 h 55 min
Yield: 8 slices
Ingredients: 40 g white sugar; 250 g cream cheese; 200 g Greek-style natural yoghurt; 250 g double cream; 1 pinch coarse salt; 1 tsp natural vanilla extract; 85 g unsalted butter; 150 g gingernut biscuits; 200 g frozen blueberries; 20 g lemon juice; 2 tsp icing sugar; 350 g frozen blueberries