This vegetarian Wellington is packed with savory mushrooms, lentils, and walnuts, all wrapped in crisp, golden pastry. I love serving it as a hearty Thanksgiving centerpiece that can be prepped ahead, leaving more time to enjoy the meal.
Why You’ll Love This Vegetarian Wellington
Every slice has a satisfying mix of earthy mushrooms, tender lentils, and crunchy walnuts tucked inside flaky pastry. The filling is rich and savory, so this Wellington feels special enough for a holiday table while using simple, easy-to-find ingredients. You can prepare the filling in advance, too, which makes the final steps easier on a busy Thanksgiving day.
Vegetarian Wellington Ingredients & Substitutions
- 1 sheet dairy-free puff pastry, thawed according to the package directions
- 2 tablespoons olive oil
- 1 medium yellow onion, finely diced
- 3 garlic cloves, minced
- 16 ounces cremini mushrooms, finely chopped
- 1 teaspoon dried thyme
- 1 tablespoon soy sauce or tamari
- 1 teaspoon Dijon mustard
- 1 cup cooked brown or green lentils, drained well
- 1/2 cup finely chopped walnuts
- 2 cups baby spinach, roughly chopped
- 1/2 cup plain breadcrumbs, plus more if needed
- 1/2 teaspoon fine salt, or to taste
- 1/4 teaspoon black pepper
- 1 tablespoon unsweetened plant milk, for brushing
- 1 tablespoon all-purpose flour, for rolling the pastry
Brown or green lentils hold their shape well in the filling. Tamari works in place of soy sauce, and chopped pecans can stand in for the walnuts. Check that your puff pastry and breadcrumbs are dairy-free, since ingredients vary between brands.
Step-by-Step Instructions to Make Vegetarian Wellington
1. Cook the vegetables
Heat the olive oil in a large skillet over medium heat. Add the onion and cook for about 4 minutes, stirring occasionally, until softened. Stir in the garlic and cook for 30 seconds. Add the mushrooms and thyme, then cook for 10 to 12 minutes, stirring often, until the mushrooms have released their liquid and the pan looks mostly dry.
2. Make the filling
Stir in the soy sauce and Dijon mustard. Add the lentils, walnuts, and spinach, and cook until the spinach wilts. Remove the skillet from the heat, then mix in the breadcrumbs, salt, and pepper. Let the filling cool completely. It should be moist enough to hold together but not wet. If it seems loose, mix in another tablespoon or two of breadcrumbs.
3. Shape the Wellington
Heat the oven to 400°F (200°C) and line a baking sheet with parchment paper. Lightly flour your work surface and roll the thawed pastry into a rectangle about 10 by 13 inches. Spoon the cooled filling down the center, leaving several inches of pastry clear on each side and a little space at the ends.
4. Wrap and brush the pastry
Fold the long sides of the pastry over the filling, then fold the ends underneath to seal. Carefully transfer the Wellington seam-side down to the baking sheet. Brush the top with plant milk. Use a sharp knife to make a few shallow slashes across the pastry, taking care not to cut all the way through.
5. Bake until golden
Bake for 35 to 45 minutes, until the pastry is puffed and deeply golden. Let it rest for 10 to 15 minutes before slicing so the filling can settle. Use a serrated knife for neat slices.
Tips for Success
- Cook the mushrooms until their released liquid has evaporated. A dry filling helps keep the pastry crisp.
- Cool the filling completely before assembling, since warm filling can soften the pastry and make it harder to handle.
- Thaw the pastry until it is flexible but still cool. If it becomes sticky, chill it briefly before wrapping.
- Chop the mushrooms finely so the filling holds together and is easy to slice.
- Rest the Wellington before cutting. This helps the filling stay in place on each plate.
Variations of Vegetarian Wellington
For a different nutty flavor, use finely chopped pecans in place of walnuts. Add a small handful of dried cranberries for a sweet-tart note that suits a holiday meal. You can also swap the spinach for finely chopped kale, cooking it until tender before adding the breadcrumbs. For extra herbs, stir in a tablespoon of chopped fresh parsley or a teaspoon of fresh rosemary.
Serving Suggestions: What to Pair with Vegetarian Wellington
Serve warm slices with mashed potatoes, roasted carrots, or green beans for a classic Thanksgiving plate. A crisp green salad balances the rich pastry, while mushroom gravy or a simple onion gravy makes a cozy finishing touch. For a family-style table, bring the whole Wellington to the table and slice it just before serving.
Storage & Reheating Instructions
Store leftover slices in an airtight container in the refrigerator for up to 4 days. Reheat them on a baking sheet in a 350°F (175°C) oven for 10 to 15 minutes, until warmed through and crisp. A microwave will warm the filling quickly, but the pastry will be softer. For make-ahead prep, cook the filling up to 2 days in advance and refrigerate it. Assemble the Wellington shortly before baking for the crispest pastry.
Memories Made Around the Table
I like bringing this Wellington to the table whole, with the golden pastry still warm from the oven. The first cut always reveals the colorful filling, and everyone can take a slice alongside their favorite sides. It makes a lovely centerpiece for a Thanksgiving meal, especially when the table is full and there is time to linger after dinner.
FAQs
Can I make vegetarian Wellington ahead of time?
Yes. Cook and cool the filling up to 2 days ahead, then keep it covered in the refrigerator. Assemble the pastry shortly before baking so it does not absorb moisture from the filling.
How do I keep the pastry from getting soggy?
Cook the mushrooms until the pan is nearly dry, drain the lentils well, and cool the filling completely before wrapping. These steps help limit extra moisture in the pastry.
Can I freeze vegetarian Wellington?
You can freeze baked, cooled slices in a freezer-safe container for up to 2 months. Thaw them in the refrigerator and reheat in the oven until hot and crisp. The pastry may be a little less flaky than when freshly baked.
What can I use instead of walnuts?
Finely chopped pecans are a good substitute. For a nut-free version, leave them out and add a few extra tablespoons of lentils or breadcrumbs to help give the filling body.
Final Thoughts
This vegetarian Wellington brings a comforting mix of mushrooms, lentils, and crisp pastry to a Thanksgiving table. With a make-ahead filling and a few simple sides, it is an inviting centerpiece to share with family and friends.
Vegetarian Wellington
Equipment
- 1 Large Skillet
- 1 Baking Sheet
- 1 Parchment Paper
- 1 Rolling Pin optional
Ingredients
- 1 sheet dairy-free puff pastry thawed according to package directions
- 2 tablespoons olive oil
- 1 medium yellow onion finely diced
- 3 cloves garlic minced
- 16 ounces cremini mushrooms finely chopped
- 1 teaspoon dried thyme
- 1 tablespoon soy sauce or tamari
- 1 teaspoon Dijon mustard
- 1 cup cooked brown or green lentils drained well
- 0.5 cup walnuts finely chopped
- 2 cups baby spinach roughly chopped
- 0.5 cup plain breadcrumbs plus more if needed; check that they are dairy-free
- 0.5 teaspoon fine salt or to taste
- 0.25 teaspoon black pepper
- 1 tablespoon unsweetened plant milk for brushing
- 1 tablespoon all-purpose flour for rolling the pastry
Instructions
- Heat the olive oil in a large skillet over medium heat. Add the onion and cook for about 4 minutes, stirring occasionally, until softened. Stir in the garlic and cook for 30 seconds. Add the mushrooms and thyme, then cook for 10 to 12 minutes, stirring often, until the mushrooms have released their liquid and the pan looks mostly dry.
- Stir in the soy sauce and Dijon mustard. Add the lentils, walnuts, and spinach, and cook until the spinach wilts. Remove the skillet from the heat, then mix in the breadcrumbs, salt, and pepper. Let the filling cool completely. It should be moist enough to hold together but not wet. If it seems loose, mix in another tablespoon or two of breadcrumbs.
- Heat the oven to 400°F (200°C) and line a baking sheet with parchment paper. Lightly flour your work surface and roll the thawed pastry into a rectangle about 10 by 13 inches. Spoon the cooled filling down the center, leaving several inches of pastry clear on each side and a little space at the ends.
- Fold the long sides of the pastry over the filling, then fold the ends underneath to seal. Carefully transfer the Wellington seam-side down to the baking sheet. Brush the top with plant milk. Use a sharp knife to make a few shallow slashes across the pastry, taking care not to cut all the way through.
- Bake for 35 to 45 minutes, until the pastry is puffed and deeply golden. Let it rest for 10 to 15 minutes before slicing so the filling can settle. Use a serrated knife for neat slices.