Chestnut Mushroom Lentil Wellington with Red Wine Gravy

The mushrooms start out crowded in the skillet, and for a while they look more like they’re steaming than browning. Keep stirring and give them time: once their liquid cooks…

By Julia • November 1, 2026 • Reading time: 10 min

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The mushrooms start out crowded in the skillet, and for a while they look more like they’re steaming than browning. Keep stirring and give them time: once their liquid cooks away, they turn deeply savory and give this Chestnut Mushroom Lentil Wellington its rich, meaty center without any meat.

I like this Wellington for a table centerpiece that can be sliced neatly and served with its gravy on the side. Lentils and walnuts make the filling substantial, while puff pastry brings the crisp, buttery layers. The part that takes patience is letting the filling cool completely before it goes into the pastry. A cool, cohesive filling makes the folding easier, and the baked crust comes out golden around the edges with a tender, earthy middle.

Why a Mushroom Wellington Needs a Dry, Brown Filling

Mushrooms release a surprising amount of liquid as they cook. If that moisture stays in the filling, it can soften the pastry from the inside before the crust has a chance to crisp. Cooking the chopped cremini until their liquid evaporates and the pieces brown isn’t busywork; it concentrates their savory flavor and keeps the filling from being watery.

There’s a useful texture balance here, too. The lentils give the log structure, walnuts add a firm bite, and breadcrumbs help hold the mixture together. Lightly mashing about a third of the lentils lets them act as a binder, but leaving most whole keeps the center from turning into a paste. You’re aiming for a filling that’s easy to mound and shape, not a smooth purée. That mix of browned mushrooms and distinct lentils is what makes each slice feel hearty without becoming dense.

What the Lentils, Mushrooms, and Pastry Each Bring

• Brown or green lentils — Both hold their shape when simmered, which matters for a filling with some bite. Red lentils soften and break down much more, so they aren’t a good stand-in here. Rinse the lentils before cooking, and drain them well so excess water doesn’t loosen the mixture.
• Cremini mushrooms — Also sold as chestnut mushrooms, they bring a deep, earthy flavor and brown nicely. Choose firm mushrooms without damp or slimy spots; there’s no need to pay extra for specialty mushrooms because cremini do the job. Chop them finely so they mix evenly with the lentils.
• Walnuts and breadcrumbs — Finely chopped walnuts contribute a nutty crunch, while plain dry breadcrumbs absorb moisture and help the cooled filling hold together. Fresh breadcrumbs are softer and wetter, so use dry ones for the intended texture. Pecans can replace the walnuts if that’s what you have, though they make the filling a little sweeter.
• Puff pastry and egg — A thawed sheet gives the Wellington its flaky shell, and beaten egg helps the folds seal and the top brown. Keep the pastry workable rather than letting it sit until it feels sticky; roll it gently only if it needs to reach the stated size. For an egg-free finish, unsweetened plant milk can be brushed over the pastry, though it won’t shine quite as deeply.
• Dry red wine and balsamic vinegar — The wine gives the gravy its full, savory depth, while balsamic brings a bright tang that keeps it from tasting heavy. A dry red table wine is the right choice; a sweet wine would make the gravy noticeably sweeter. Use a wine you’d be comfortable drinking, but an expensive bottle isn’t needed.

Build the Filling Before You Bring Out the Pastry

Simmer the Lentils Until They Hold Their Shape

Combine the rinsed lentils and water in a 2-quart saucepan and bring them to a boil over medium-high heat. Lower the heat and simmer uncovered for 20 to 25 minutes, checking for lentils that are tender but still intact. If they’re splitting apart, they’ve gone too far for this filling. Drain them well while you work on the mushrooms.

Cook the Mushrooms Down Until They Brown

Heat the olive oil in a 12-inch skillet over medium heat, then cook the diced onion for 4 minutes. Add the chopped mushrooms, salt, and pepper, and stir often for 12 to 15 minutes. At first, the pan will look wet; keep cooking until the liquid has evaporated and the mushrooms take on browned edges. Stir in the garlic, thyme, and tomato paste and cook for 1 minute, just until fragrant.

Mix and Cool the Filling Completely

Add the soy sauce, drained lentils, and chopped walnuts to the skillet, then cook for 2 minutes. Lightly mash about one-third of the lentils as you stir, keeping the rest whole. Spread the filling on a plate and let it cool completely, about 25 to 30 minutes, before stirring in the breadcrumbs. Warm filling can make the pastry harder to handle, so don’t rush this cooling stage.

Fold the Wellington Seam-Side Down

Heat the oven to 400°F and line a rimmed baking sheet with parchment paper. Set the thawed pastry on the sheet and gently roll it to about 10 by 15 inches if needed, then mound the filling into a 9-by-3-inch log down the center. Brush the pastry edges with beaten egg, fold the short ends over the filling, and bring the long sides over to overlap underneath. Brush the top with the remaining egg so it bakes up evenly golden.

Simmer the Gravy While the Pastry Bakes

Bake for 35 to 45 minutes, until the pastry is deep golden brown and crisp. While it bakes, melt the butter in a 2-quart saucepan over medium heat, add the minced shallot, and cook for 2 to 3 minutes until softened. Whisk in the flour and cook for 1 minute, then gradually whisk in the wine and vegetable broth until smooth. Whisk in the Dijon and balsamic, and simmer for 8 to 12 minutes, whisking often, until the gravy lightly coats the back of a spoon; rest the Wellington for 10 minutes before slicing.

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Chestnut Mushroom Lentil Wellington with Red Wine Gravy

Chestnut mushroom lentil Wellington is a savory vegetarian centerpiece wrapped in flaky puff pastry and served with a silky red wine gravy. Lentils, browned mushrooms, and walnuts make a hearty filling that slices neatly after resting.

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Prep Time 20 minutes mins

Cook Time 1 hour hr 5 minutes mins

Cooling and resting 40 minutes mins

Total Time 2 hours hrs 5 minutes mins

Servings: 6 servings

Course: Dinner

Cuisine: British

Calories: 500

Ingredients Equipment Method Notes

Ingredients

  

Make the filling

• 0.75 cup brown or green lentils rinsed
• 3 cups water
• 2 tbsp olive oil
• 1 yellow onion medium, finely diced
• 1 lb cremini mushrooms chestnut, finely chopped
• 1 tsp kosher salt
• 0.5 tsp black pepper
• 3 cloves garlic minced
• 1 tsp thyme leaves fresh
• 1 tbsp tomato paste
• 1 tbsp soy sauce
• 0.5 cup walnuts finely chopped
• 0.5 cup plain dry breadcrumbs

For the assembly

• 1 frozen puff pastry sheet (about 8 ounces), thawed
• 1 egg large, beaten

For the red wine gravy

• 2 tbsp unsalted butter
• 1 shallot small, minced
• 2 tbsp all-purpose flour
• 1 cup dry red wine
• 1.5 cups vegetable broth
• 1 tsp Dijon mustard
• 1 tbsp balsamic vinegar

Equipment

• 1 2-quart saucepan
• 1 12-inch skillet
• 1 rimmed baking sheet

Method

 

Make the filling

1. Combine the lentils and water in a 2-quart saucepan.
2. Bring to a boil over medium-high heat, then reduce the heat and simmer uncovered for 20-25 minutes, until tender but still holding their shape; drain well.
3. Meanwhile, heat the olive oil in a 12-inch skillet over medium heat.
4. Add the onion and cook for 4 minutes.
5. Add the mushrooms, salt, and pepper and cook for 12-15 minutes, stirring often, until their liquid has evaporated and the mushrooms are browned.
6. Stir in the garlic, thyme, and tomato paste and cook for 1 minute.
7. Add the soy sauce, drained lentils, and walnuts; cook for 2 minutes, lightly mashing about one-third of the lentils.
8. Spread the filling on a plate and cool completely, about 25-30 minutes.
9. Stir the breadcrumbs into the cooled filling.

Assemble and bake

1. Preheat the oven to 400°F.
2. Line a rimmed baking sheet with parchment paper.
3. Place the thawed pastry on the baking sheet and gently roll it to about 10 by 15 inches if needed.
4. Mound the filling into a 9-by-3-inch log down the center.
5. Brush the pastry edges with beaten egg.
6. Fold the short ends over the filling, then fold the long sides over to overlap underneath.
7. Brush the top with the remaining egg.
8. Bake for 35-45 minutes, until the pastry is deep golden brown and crisp.

Make the red wine gravy

1. While the Wellington bakes, melt the butter in a 2-quart saucepan over medium heat.
2. Add the shallot and cook for 2-3 minutes until softened.
3. Whisk in the flour and cook for 1 minute.
4. Gradually whisk in the wine and broth until smooth.
5. Whisk in the Dijon mustard and balsamic vinegar.
6. Simmer for 8-12 minutes, whisking often, until the gravy lightly coats the back of a spoon.
7. Transfer the Wellington to a cutting board and rest for 10 minutes.
8. Slice and serve with the warm gravy.

Notes

For neat slices, cool the filling completely before assembling. Refrigerate leftovers for up to 3 days; freezer: yes, freeze baked slices. For a vegan version, use vegan puff pastry and butter and replace the egg wash with plant milk.