I love bringing this vegetarian Wellington recipe to the Thanksgiving table because its flaky golden pastry makes a beautiful centerpiece, while the savory mushroom and lentil filling feels hearty and comforting. It is entirely plant-based, easy to prepare ahead, and delicious with classic holiday sides.
Why You’ll Love This Vegetarian Wellington
This Wellington pairs earthy mushrooms, tender lentils, spinach, and herbs in crisp pastry. The filling is satisfying without feeling too heavy, and each slice looks special enough for a holiday meal. You can prepare the filling in advance, making the final assembly much easier on a busy day.
Vegetarian Wellington Ingredients & Substitutions
- 2 tablespoons olive oil
- 1 medium yellow onion, finely chopped
- 1 pound cremini mushrooms, finely chopped
- 3 cloves garlic, minced
- 1 teaspoon fresh thyme leaves, or 1/2 teaspoon dried thyme
- 1 teaspoon chopped fresh sage, or 1/2 teaspoon dried sage
- 1 cup cooked brown or green lentils, drained well
- 2 cups baby spinach, roughly chopped
- 1/3 cup chopped walnuts, optional
- 1/2 cup plain breadcrumbs
- 1 tablespoon soy sauce or tamari
- 1 teaspoon Dijon mustard
- 1/2 teaspoon salt, plus more to taste
- 1/4 teaspoon black pepper
- 1 sheet dairy-free puff pastry, thawed according to package directions
- 2 tablespoons unsweetened plant milk, for brushing
- 1 teaspoon sesame seeds, optional
Use tamari for a gluten-free option, and choose gluten-free breadcrumbs and pastry if needed. Walnuts add crunch, but you can leave them out or replace them with sunflower seeds.
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 4 to 5 minutes, stirring occasionally, until soft. Add the mushrooms and cook for 10 to 12 minutes, until their moisture has evaporated and the mushrooms are browned. Stir in the garlic, thyme, and sage, and cook for 30 seconds.
2. Make the filling
Add the lentils, spinach, walnuts if using, breadcrumbs, soy sauce, Dijon mustard, salt, and pepper. Stir until evenly combined and the spinach has wilted. Taste and adjust the seasoning. Spread the mixture on a plate or tray and let it cool completely so the pastry stays crisp.
3. Shape the Wellington
Heat the oven to 400°F (200°C) and line a baking sheet with parchment paper. Unfold the puff pastry on a lightly floured surface. Spoon the cooled filling down the center, leaving a border on every side. Fold the pastry over the filling, overlap the edges, and press gently to seal. Place it seam-side down on the prepared baking sheet.
4. Brush and bake
Brush the pastry with plant milk and sprinkle with sesame seeds, if desired. Cut a few small slits in the top to let steam escape. Bake for 30 to 40 minutes, until puffed and deep golden. Rest for 10 minutes before slicing with a sharp serrated knife.
Tips for Success
- Cook the mushrooms until their liquid has evaporated. A dry filling helps prevent soggy pastry.
- Cool the filling completely before wrapping it in pastry.
- Keep the pastry cold but pliable. If it becomes too soft while shaping, chill the assembled Wellington for 10 minutes before baking.
- Check the pastry ingredients, since some ready-made varieties contain butter or other dairy.
- Let the Wellington rest before cutting so the filling holds together in neat slices.
Variations of Vegetarian Wellington
For a deeper, nutty flavor, replace some of the lentils with cooked chestnuts. Add finely chopped roasted red pepper for a sweeter filling, or stir in a handful of dried cranberries for a festive note. You can also swap the spinach for chopped kale, cooking it until tender before adding the remaining filling ingredients.
Serving Suggestions: What to Pair with Vegetarian Wellington
Serve warm slices with mashed potatoes, roasted carrots, green beans, or Brussels sprouts. A simple salad with crisp greens adds a fresh contrast, while a savory mushroom or vegetable gravy makes the meal feel especially cozy. For a holiday spread, add cranberry sauce and your favorite roasted vegetables.
Storage & Reheating Instructions
Store leftover slices in an airtight container in the refrigerator for up to 3 days. Reheat them on a baking sheet in a 350°F (175°C) oven for 10 to 15 minutes, until hot and crisp. The microwave works for a quick portion, but the pastry will be softer. You can also freeze the baked Wellington, tightly wrapped, for up to 2 months. Thaw it in the refrigerator before reheating in the oven.
Memories Made Around the Table
I love the moment this Wellington comes out of the oven, golden and fragrant with mushrooms, garlic, and herbs. Slicing it at the table turns a simple plant-based main into a shared holiday moment, especially when everyone reaches for one more spoonful of gravy and vegetables.
FAQs
Can I make vegetarian Wellington ahead of time?
Yes. Prepare the filling up to 2 days ahead and keep it covered in the refrigerator. Assemble the Wellington shortly before baking for the crispest pastry.
Can I assemble it the night before?
You can assemble it several hours ahead and refrigerate it covered. Brush with plant milk just before baking, and allow a few extra minutes in the oven if it is very cold.
How do I keep the pastry from getting soggy?
Cook the mushrooms until their moisture has evaporated, cool the filling completely, and avoid adding wet ingredients. A short rest after baking also helps the slices hold together.
Can I make this without nuts?
Yes. Leave out the walnuts or replace them with sunflower seeds. The filling will still be hearty and flavorful.
Final Thoughts
This vegetarian Wellington is a festive, flavorful centerpiece with crisp pastry and a savory lentil-mushroom filling. Prepare the filling ahead, serve it with your favorite Thanksgiving sides, and enjoy a holiday main that looks as lovely as it tastes.
Vegetarian Wellington
Equipment
- 1 Large Skillet
- 1 Baking Sheet
- 1 Parchment Paper
- 1 Serrated knife
Ingredients
Wellington
- 2 tablespoons olive oil
- 1 medium yellow onion finely chopped
- 1 pound cremini mushrooms finely chopped
- 3 cloves garlic minced
- 1 teaspoon fresh thyme leaves or 1/2 teaspoon dried thyme
- 1 teaspoon fresh sage chopped; or 1/2 teaspoon dried sage
- 1 cup cooked brown or green lentils drained well
- 2 cups baby spinach roughly chopped
- 0.33 cup walnuts chopped; optional
- 0.5 cup plain breadcrumbs
- 1 tablespoon soy sauce or tamari
- 1 teaspoon Dijon mustard
- 0.5 teaspoon salt plus more to taste
- 0.25 teaspoon black pepper
- 1 sheet dairy-free puff pastry thawed according to package directions
- 2 tablespoons unsweetened plant milk for brushing
- 1 teaspoon sesame seeds optional
Instructions
- Heat the olive oil in a large skillet over medium heat. Add the onion and cook for 4 to 5 minutes, stirring occasionally, until soft. Add the mushrooms and cook for 10 to 12 minutes, until their moisture has evaporated and the mushrooms are browned. Stir in the garlic, thyme, and sage, and cook for 30 seconds.
- Add the lentils, spinach, walnuts if using, breadcrumbs, soy sauce, Dijon mustard, salt, and pepper. Stir until evenly combined and the spinach has wilted. Taste and adjust the seasoning. Spread the mixture on a plate or tray and let it cool completely.
- Heat the oven to 400°F (200°C) and line a baking sheet with parchment paper. Unfold the puff pastry on a lightly floured surface. Spoon the cooled filling down the center, leaving a border on every side. Fold the pastry over the filling, overlap the edges, and press gently to seal. Place it seam-side down on the prepared baking sheet.
- Brush the pastry with plant milk and sprinkle with sesame seeds, if desired. Cut a few small slits in the top to let steam escape. Bake for 30 to 40 minutes, until puffed and deep golden. Rest for 10 minutes before slicing with a sharp serrated knife.