Scrape the vanilla pod and add the seeds to the Elle & Vire® Sublime, Cream with Mascarpone together with the icing sugar. Whip.
Mix the sugar with the pectin NH. Heat the yuzu purée and the apple at 50°C (122°F). Add the sugar mix. Bring to the boil. Pour the coulis into an 18 cm x 24 cm frame. Leave to cool in the fridge. Once the coulis has set, cut into 12 x 3 cm rectangles. Keep in the fridge until you are ready to assemble the millefeuille.
Smooth the cooled crème pâtissière, whip the Elle & Vire® Sublime, Cream with Mascarpone, then mix the two together.
Knead the flour, salt, melted butter, cold water and vinegar together. Form a ball, and leave to rest in the fridge. Shape the pastry into a square. Between two layers of greaseproof paper, make another square of an identical size with the Elle & Vire® Extra Dry Butter. Fold and repeat 5 times. Roll out the puff pastry to 2 mm and cut to the desired shape.
Cook at 165°C (329°F) for about 15 minutes. When cooked, caramelise the puff pastry in the oven at 250°C (482°F). Keep a close eye on it. To finish, cut into 12 x 3 rectangles.
Put a rectangle of puff pastry on each side of an apple-yuzu rectangle. Pipe the light cream onto the upper layer of puff pastry and cover with a final layer of puff pastry. Lay the millefeuille on its edge, and decorate it with the vanilla cream with mascarpone using a piping bag fitted with a V-shaped Saint Honoré nozzle.