Directions
<ol class="no-list-style"><li class="MethodStepper"><h4 class="step-title">Step 1</h4>Preheat your oven to 200°C (180°C fan/gas mark 6). Line a large baking sheet with parchment paper. In a large bowl, toss the butternut squash, carrots, and red pepper with 2 tablespoons of olive oil, salt, and pepper. Spread on the baking sheet in a single layer and roast for 25-30 minutes until tender and the edges are beginning to caramelize. This roasting process concentrates the flavors and ensures the vegetables won't release too much moisture in your Wellington.</li><li class="MethodStepper"><h4 class="step-title">Step 2</h4>While the vegetables are roasting, prepare your mushroom duxelles. Heat the remaining tablespoon of olive oil in a large frying pan over medium heat. Add the shallots and cook until translucent, about 3 minutes. Add the garlic and cook for another minute until fragrant. Add the finely chopped mushrooms, thyme, and a good pinch of salt. Cook for 15-20 minutes, stirring occasionally, until all moisture has evaporated and you have a thick, paste-like mixture. This dehydration is crucial to prevent a soggy pastry bottom.</li><li class="MethodStepper"><h4 class="step-title">Step 3</h4>In the same pan, wilt the spinach in batches if necessary, just until collapsed. Transfer to a colander and press firmly with the back of a spoon to remove excess moisture. Roughly chop and set aside.</li><li class="MethodStepper"><h4 class="step-title">Step 4</h4>Once the mushroom mixture has cooled slightly, stir in the breadcrumbs, Dijon mustard, and balsamic vinegar. Season to taste with salt and pepper. This mixture forms the savory base of your Wellington and helps absorb any additional moisture released during baking.</li><li class="MethodStepper"><h4 class="step-title">Step 5</h4>Roll out your puff pastry on a lightly floured surface to a rectangle approximately 35cm x 25cm (14" x 10"). Transfer to a piece of parchment paper. Spread the mushroom duxelles mixture down the center of the pastry, leaving a 5cm border on all sides. Arrange the chopped spinach in an even layer on top of the duxelles.</li><li class="MethodStepper"><h4 class="step-title">Step 6</h4>Arrange your roasted vegetables on top of the spinach layer, creating a colorful, compact mound. Be careful not to overfill, as this could cause the pastry to tear during baking. Press the vegetables gently together to create a firm filling.</li><li class="MethodStepper"><h4 class="step-title">Step 7</h4>Beat the egg with the tablespoon of milk to create your egg wash. Brush the exposed pastry borders with egg wash. Carefully fold the long sides of the pastry over the filling, overlapping in the center. Pinch the ends to seal and fold them underneath. The egg wash acts as a glue to help seal the pastry.</li><li class="MethodStepper"><h4 class="step-title">Step 8</h4>Carefully flip the Wellington over so the seam is underneath and transfer it (still on the parchment paper) to a baking sheet. Brush the entire Wellington with egg wash for a beautiful golden finish. Using the tip of a sharp knife, score a diamond pattern across the top, being careful not to cut all the way through the pastry. Cut three small slits in the top to allow steam to escape during baking.</li><li class="MethodStepper"><h4 class="step-title">Step 9</h4>Chill the Wellington in the refrigerator for 20-30 minutes. This resting period allows the pastry to firm up, which helps maintain its shape during baking and creates those beautiful flaky layers.</li><li class="MethodStepper"><h4 class="step-title">Step 10</h4>Bake the Wellington in the preheated oven for 40-45 minutes until the pastry is risen and deeply golden. If the pastry starts to brown too quickly, loosely cover with foil. Allow to rest for 10 minutes before slicing with a sharp serrated knife. This resting period allows the filling to set, making for cleaner slices and ensuring you don't burn your mouth on the hot filling.</li></ol>