“Finding plant-based main dishes for a holiday meal, can be a serious challenge!” shares authors Jillian Harris and Tori Wesszer of 2020 Shortlisted cookbook, Fraiche Foods, Full Hearts. “We played around with a few ideas and finally fell head over heels in love with this dish that Jillian created — she seriously knocked it out of the park! This veggie Wellington is packed with goodness, super hearty, and absolutely craveable, and it had all of our meat-eating family members begging for more (not an easy thing, for the record). To top it off, the filling can be prepared a day in advance. It is as close to perfect as they come.”
Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.
Make the Potato Mixture:
In a large non-stick frying pan, melt the vegan butter over medium-low heat. Add the potatoes and cook, stirring, until softened, about 5 minutes. Add the carrots and celery and cook, stirring occasionally, until the vegetables are soft, about 10 minutes. Remove from the heat and scrape the mixture into a medium bowl.
Make the Mushroom Mixture:
In the same frying pan, melt the vegan butter over medium heat. Add the onions and cook until soft and translucent, about 4 minutes, stirring occasionally. Add the garlic and mushrooms and continue to cook, stirring occasionally, until the mushrooms soften, 3 to 5 minutes. Add the concentrated vegetarian stock, red wine, thyme, and sage. Cook until the wine is reduced by half.
Add the mushroom mixture to the potato mixture. Stir in the panko crumbs and season with salt and pepper. (The filling can be made 1 day ahead. Keep in the fridge, covered.)
Assemble the Mushroom Wellingtons:
Arrange one sheet of puff pastry on a work surface with the long side facing you. Spoon half of the vegetable mixture lengthwise across the lower-half of the pastry, leaving a 2- to 3-inch (5 to 8 cm) border, pressing the mixture together with your hands to form a roll. Fold the sides of the pastry over the filling, then roll it up, starting at the end closest to you. Repeat with the second Wellington.