Vanilla Mille-feuille with Caramel and Pecan Nuts

Name: Vanilla Mille-feuille with Caramel and Pecan Nuts
Prep time: 35 min
Cook time: 13 h 10 min
Total time: 13 h 10 min
Yield: 6 portions
Ingredients: 2 gelatin sheets; cold water; 85 g white chocolate; 395 g cream, 35 % fat; 1 vanilla pod; 100 g sugar; 45 g butter, unsalted; 3 g cream, 35 % fat; 315 g pecan nut; 30 g water; 115 g sugar; 1 pinch salt; 2 tbsp hazelnut oil; 1 sheet puff pastry; 15 g powdered sugar