First thing first, I suggest to make the mille-feuille dough from a day before because it has a lot of chilling time. If you don’t have time for this, you can also buy a frozen puff pastry – but of course it will not be as tasty as homemade.
For mille-feuille, I’ve mixed the flour, salt and 2 spoons of the butter in bowl and united them with my hands. Then I’ve added water and lemon juice in the middle, and incorporated gradually with a fork and knead until it’s a semi smooth dough. After patting it into a flat shape, I’ve wrapped it in plastic to refrigerate for 2 hours. When I was waiting for it, I’ve beaten the rest of the butter until it’s soft and I’ve formed it into a square – smaller than the dough. This also went to refrigerator.
I’ve took out dough and butter and started to work on a floured surface. I’ve placed the butter in the middle of the dough and with the corners of the dough I’ve completely hidden the butter in it. Then I’ve rolled it into a rectangle and started folding each sides to the centre and rolled again. I wrapped it again to plastic to refrigerate for 2 hours. This folding and refrigeration ceremony repeated by me for 3 times, until the dough is finally ready!
For pumpkin filling, I’ve cut the pumpkin into 2, scraped out the seeds and pulp from inside. After that I’ve cut the pieces into smaller pieces so they can cook easier. I’ve placed the pieces on a baking paper, and baked them for 45 minutes in 350°F (180°C) oven until they are fork-tender. When they are cooled down, I’ve carved it out from the skin and mashed them roughly with a fork and pass them from a colander. At this point, I’ve added the sugar and pumpkin spices and let it cool for a while before I’ve add some dissolved gelatin to give a better texture which would allow me to pipe it and keep the shape.
For wild blueberry jam, I’ve just put the washed wild blueberries and sugar in a sauce pan and cooked it in medium heat until it boils. Then I left to cool down, to use it later as a sauce in my plate, as well as in the other filling.
I’ve whipped the whipping cream, added the icing sugar, wild blueberry jam and around 2 table spoons of dissolved gelatin into the whipped cream. After mixing all these and I’ve put it in the refrigerator and kept until I prepare the mille-feuille.
I preferred a round shape for the pastry, so I’ve cut some rounds from my puff pastry and made some holes with a fork. I baked them for 15 minutes in 375°F (190°C) oven.
When everything cooled down, I’ve used a disposable decorating bag to fill the pastry with cream; one side with spicy pumpkin cream, the other side with wild blueberry cream. I’ve used different piping nozzles for fun! Look at those pretty colours – they are perfectly matching!