I love bringing a golden, savory Wellington to the Thanksgiving table, especially when it is filled with mushrooms, lentils, and herbs. This vegetarian Wellington recipe has crisp, flaky pastry around a hearty plant-based filling, and it is easy to prepare ahead for a relaxed holiday meal.
Why You’ll Love This Vegetarian Wellington
The filling is rich and satisfying, with mushrooms for deep savory flavor, lentils for substance, and walnuts for a little crunch. Puff pastry bakes up beautifully golden, making this a festive centerpiece without complicated steps. You can also make the filling ahead, then assemble and bake the Wellington shortly before serving.
Vegetarian Wellington Ingredients & Substitutions
- 1 sheet vegan puff pastry, about 17 ounces, thawed according to package directions
- 2 tablespoons olive oil
- 1 medium yellow onion, finely chopped
- 3 garlic cloves, minced
- 1 pound cremini mushrooms, finely chopped
- 1 teaspoon fresh thyme leaves, or 1/2 teaspoon dried thyme
- 1/2 teaspoon dried sage
- 1 tablespoon soy sauce or tamari
- 1 teaspoon Dijon mustard
- 1 1/2 cups cooked brown or green lentils, drained well
- 1/2 cup finely chopped walnuts
- 2 cups baby spinach, roughly chopped
- 1/2 cup plain breadcrumbs
- 1 tablespoon ground flaxseed mixed with 3 tablespoons water
- 1 tablespoon unsweetened plant milk, for brushing
- 1/2 teaspoon salt, plus more to taste
- 1/4 teaspoon black pepper
Cremini mushrooms give the filling a classic savory flavor, but white button mushrooms work too. Use tamari for a gluten-free option, along with gluten-free breadcrumbs and pastry. Check the pastry label to make sure it is made without butter if you want the whole dish to be plant-based.
Step-by-Step Instructions to Make Vegetarian Wellington
1. Prepare the flax mixture
Stir the ground flaxseed and water together in a small bowl. Let it rest for about 10 minutes, until thickened. Heat the oven to 400°F and line a baking sheet with parchment paper.
2. Cook the mushroom filling
Warm the olive oil in a large skillet over medium heat. Add the onion and cook for 4 to 5 minutes, stirring until softened. Add the garlic, mushrooms, thyme, sage, salt, and pepper. Cook for 10 to 14 minutes, stirring often, until the mushrooms release their liquid and the pan is nearly dry.
3. Finish and cool the filling
Stir in the soy sauce and Dijon mustard, then add the lentils, walnuts, and spinach. Cook for 2 to 3 minutes, until the spinach wilts. Remove the skillet from the heat and stir in the breadcrumbs and thickened flax mixture. Let the filling cool completely so it does not soften the pastry.
4. Fill and shape the pastry
Unfold the thawed pastry on a lightly floured surface. Spoon the cooled filling down the center, leaving a border on each side. Fold one long side over the filling, brush the edge with a little plant milk, and fold the other side over to seal. Pinch the ends closed and place the Wellington seam-side down on the prepared baking sheet.
5. Bake until golden
Brush the top and sides lightly with plant milk. Use a sharp knife to cut a few small slits in the top so steam can escape. Bake for 35 to 45 minutes, until puffed and deeply golden. Rest for 10 to 15 minutes before slicing.
Tips for Success
- Cook the mushrooms until most of their moisture has evaporated. A dry filling helps keep the pastry crisp.
- Cool the filling fully before assembling. Warm filling can make puff pastry sticky and difficult to handle.
- Thaw pastry in the refrigerator rather than leaving it somewhere warm, and work with it while it is still cool.
- Use a serrated knife and a gentle sawing motion to cut neat slices without crushing the flaky layers.
- Ovens can vary, so use the deep golden color of the pastry as your cue that the Wellington is ready.
Variations of Vegetarian Wellington
For extra festive flavor, add 1/3 cup dried cranberries or chopped cooked chestnuts to the cooled filling. Swap the walnuts for pecans or sunflower seeds, or add a finely diced carrot with the onion. If you enjoy a more herb-forward filling, stir in chopped parsley or rosemary. For a simpler version, leave out the spinach and add another 1/2 cup of cooked lentils.
Serving Suggestions: What to Pair with Vegetarian Wellington
Serve slices with mashed potatoes, roasted carrots, green beans, or Brussels sprouts for a Thanksgiving plate that feels generous and comforting. A simple mushroom gravy or onion gravy is lovely alongside, and a crisp green salad helps balance the richness of the pastry.
Storage & Reheating Instructions
Store leftover Wellington in an airtight container in the refrigerator for up to 3 days. Reheat slices on a baking sheet in a 350°F oven for 10 to 15 minutes, until warmed through and crisp again. The microwave works in a pinch, but the pastry will be softer. You can make the filling up to 2 days ahead and refrigerate it; assemble the Wellington shortly before baking for the best texture.
Memories Made Around the Table
I like setting this Wellington in the center of the table and letting everyone admire the crisp golden crust before I slice it. It has the kind of cozy, savory filling that invites people to linger over dinner, pass the sides around, and go back for one more piece.
FAQs
Can I make vegetarian Wellington ahead of time?
Yes. Make the filling up to 2 days ahead and keep it covered in the refrigerator. For the flakiest pastry, assemble and bake the Wellington on the day you plan to serve it.
How do I keep the bottom pastry from getting soggy?
Cook the mushroom mixture until the skillet is nearly dry, cool the filling completely, and bake the Wellington on a preheated baking sheet if you want extra browning underneath.
Can I freeze vegetarian Wellington?
You can freeze the baked Wellington after it has cooled. Wrap it well and freeze for up to 2 months. Thaw overnight in the refrigerator, then reheat in a 350°F oven until hot and crisp.
What can I use instead of walnuts?
Chopped pecans, pumpkin seeds, or sunflower seeds all add a pleasant bit of texture. You can also leave them out and add a little more lentil or breadcrumb.
Final Thoughts
This vegetarian Wellington brings flaky pastry and a hearty mushroom-lentil filling to the Thanksgiving table in a showstopping but approachable way. Serve it with your favorite holiday sides, and enjoy the leftovers while the pastry is still crisp.
Vegetarian Wellington
Equipment
- 1 Skillet large
- 1 Baking Sheet lined with parchment paper
- 1 Small bowl for flax mixture
Ingredients
- 1 sheet vegan puff pastry about 17 ounces, thawed according to package directions
- 2 tablespoons olive oil
- 1 medium yellow onion finely chopped
- 3 garlic cloves minced
- 1 pound cremini mushrooms finely chopped
- 1 teaspoon fresh thyme leaves or 1/2 teaspoon dried thyme
- 0.5 teaspoon dried sage
- 1 tablespoon soy sauce or tamari
- 1 teaspoon Dijon mustard
- 1.5 cups cooked brown or green lentils drained well
- 0.5 cup walnuts finely chopped
- 2 cups baby spinach roughly chopped
- 0.5 cup plain breadcrumbs
- 1 tablespoon ground flaxseed mixed with 3 tablespoons water
- 1 tablespoon unsweetened plant milk for brushing
- 0.5 teaspoon salt plus more to taste
- 0.25 teaspoon black pepper
Instructions
- Stir the ground flaxseed and water together in a small bowl. Let it rest for about 10 minutes, until thickened. Heat the oven to 400°F and line a baking sheet with parchment paper.
- Warm the olive oil in a large skillet over medium heat. Add the onion and cook for 4 to 5 minutes, stirring until softened. Add the garlic, mushrooms, thyme, sage, salt, and pepper. Cook for 10 to 14 minutes, stirring often, until the mushrooms release their liquid and the pan is nearly dry.
- Stir in the soy sauce and Dijon mustard, then add the lentils, walnuts, and spinach. Cook for 2 to 3 minutes, until the spinach wilts. Remove the skillet from the heat and stir in the breadcrumbs and thickened flax mixture. Let the filling cool completely so it does not soften the pastry.
- Unfold the thawed pastry on a lightly floured surface. Spoon the cooled filling down the center, leaving a border on each side. Fold one long side over the filling, brush the edge with a little plant milk, and fold the other side over to seal. Pinch the ends closed and place the Wellington seam-side down on the prepared baking sheet.
- Brush the top and sides lightly with plant milk. Use a sharp knife to cut a few small slits in the top so steam can escape. Bake for 35 to 45 minutes, until puffed and deeply golden. Rest for 10 to 15 minutes before slicing.