Puff pastry dessert with blueberries. Technique learned from a pastry chef

Puff pastry dessert with blueberries. Technique learned from a pastry chef Ingredients blueberries: 400 g (14 oz) sour cream: 300 g (11 oz) eggs: 2 pc sugar: 90 g (3.2 oz) condensed milk: 100 g (3.5 oz) white chocolate: 80 g (2.8 oz) puff pastry: 400 g (14 oz) eggs: 1 pc The drink condensed milk: 25 g (0.9 oz) ground coffee: 40 g (1.4 oz) milk: 100 ml (3.4 fl oz) Sauce water: 100 ml (3.4 fl oz)