Name: Mushroom Wellington: A Vegetarian Showstopper for Thanksgiving
Prep time: 30 min
Cook time: 55 min
Total time: 1 h 25 min
Ingredients: 750 g cremini mushrooms, finely chopped; 2 shallots, finely chopped; 3 clove garlic, minced; 3 tbsp olive oil; 2 tbsp butter; 1 tbsp fresh thyme, leaves; 150 g cooked chestnuts, chopped; 80 g walnuts, toasted and chopped; 1 tbsp soy sauce; 60 ml dry white wine, or vegetable stock; 1 tbsp Dijon mustard; 150 g spinach; 40 g breadcrumbs; 1 puff pastry, about 320 g, thawed; 1 egg, beaten, with 1 tbsp milk; 1 tsp salt; ½ tsp black pepper

Autumn Winter Vegetarian 1 h 25 min 6 servings570 Calories

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Mushroom Wellington is a vegetarian take on the classic beef Wellington: a savoury filling of roasted mushrooms, chestnuts and walnuts, wrapped in golden puff pastry and sliced like a roast. It tastes deeply earthy and rich, and it is searched for more every year as hosts look for a main dish that vegetarians and meat-eaters will both happily share. With Thanksgiving on November 26 and Christmas not far behind, now is the ideal time to practise it.

Why it works as a centrepiece

Mushrooms cooked until completely dry concentrate their flavour, while chestnuts add a gentle sweetness and walnuts bring body and a little bite. Soy sauce and thyme supply the savoury depth people expect from a roast. Best of all, you can assemble the whole Wellington a day ahead and simply bake it when guests arrive, which frees the oven and your attention on the big day.

Tips for a crisp, not soggy, pastry

Cook the mushrooms dry. Chop them finely and cook until the pan is nearly dry and the mixture looks like a thick paste. Any water left in the filling will soften the pastry.
Cool the filling completely. Warm filling melts the butter in the pastry and stops it puffing.
Add a barrier. A layer of wilted, squeezed-dry spinach and a sprinkle of breadcrumbs under the filling soaks up moisture.
Seal and chill. Tuck the seam underneath, brush with egg wash and chill for 20 minutes before baking so the shape holds.
Bake on a hot tray. Preheating the baking sheet crisps the underside.

Ingredient notes

Cremini (brown) mushrooms are widely available and give the best flavour for the price; a mix with a few shiitake is lovely. Cooked, peeled chestnuts come vacuum-packed or in jars at most supermarkets in autumn. If you cannot find them, use extra walnuts or pecans. Check the puff pastry label: many brands are accidentally vegan, and all-butter versions taste best.

Variations

Vegan: use vegan puff pastry, swap butter for olive oil and brush with plant milk and a little maple syrup.
Cheesy: add 100 g crumbled goat cheese or a layer of Gruyère. Note that Parmesan is not vegetarian.
Persian-inspired: stir a pinch of saffron and a spoonful of chopped dried barberries or cranberries into the filling for a sweet-tart note.
Individual portions: cut the pastry into squares and make small parcels that bake in 25 minutes.

Serving ideas and menu

Serve slices with a glossy onion gravy, roasted carrots with thyme, creamy mashed potatoes and a tart cranberry sauce. A crunchy shaved Brussels sprout salad cuts through the richness. Many vegetarian guests also appreciate a nutty, herby stuffing on the side.

Make-ahead and storage

Assemble the unbaked Wellington up to 24 hours ahead, cover and refrigerate, adding the egg wash just before baking. You can also freeze it unbaked for up to a month and bake from frozen, adding about 15 minutes. Leftover slices keep in the fridge for three days; reheat on a tray in a 180°C / 350°F oven so the pastry crisps again rather than in the microwave.

Who should be careful: the dish contains gluten, egg and tree nuts (walnuts and chestnuts are different allergens), so label it clearly for guests with allergies.

Planning the whole meal? See our complete Thanksgiving dinner guide with a make-ahead timeline and every recipe in one place.