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Mushroom Wellington with Onion Gravy & Mash

Mushroom Wellington with Onion Gravy & Mash

4.5rating out of 5

(1165 reviews from our customers)

Prep Time

50 min



Our vegetarian wellington is packed with mushrooms, sage and walnuts. Pour over a caramelised onion gravy and serve over fluffy mashed potato. Perfect for a cosy evening in!

Prep Time

50 min



What is Gousto all about?

We send you everything you need to cook amazing recipes like this, delivered right to your door. Leave the planning to us!

What is Gousto all about?

We send you everything you need to cook amazing recipes like this, delivered right to your door. Leave the planning to us!

For 2 people (double for 4)
1 red onion
1 shallot
1 garlic clove
1 soy sauce sachet (8ml) †
1 bag of walnuts (25g) †
dried sage
1 tsp dried sage
120g shredded kale
vegetable stock cube (new5/18)
1/2 Knorr vegetable stock cube †
1 balsamic vinegar sachet (15ml) †
puff pastry
120g traditional puff pastry †
250g chestnut mushrooms
3 white potatoes
You Will Need
Food processor, tin foil, non-stick baking paper, butter, flour, milk, olive oil, pepper, salt

Nutritional Information*

Percentages are based on an adult's daily intake

  • 1 red onion
  • 1 shallot
  • 1 garlic clove
  • 1 soy sauce sachet (8ml)<span class="strong">†</span>
  • 1 bag of walnuts (25g)<span class="strong">†</span>
  • 1 tsp dried sage
  • 120g shredded kale
  • 1 Knorr vegetable stock cube<span class="strong">†</span>
  • 1 balsamic vinegar sachet (15ml)<span class="strong">†</span>
  • 120g traditional puff pastry<span class="strong">†</span>
  • 250g chestnut mushrooms
  • 1 white potato
Typical Values per 100g per serving
Energy 580 kJ
138 kcal
2193 kJ
522 kcal
of which saturates
6.8 g
3.1 g
25.8 g
11.5 g
of which sugars
12.4 g
1.6 g
47 g
6.1 g
Fibre 1.8 g 6.7 g
Protein 3.5 g 13.4 g
Salt 0.85 g 3.22 g
*Gousto’s nutritional information only applies to ingredients supplied by Gousto. The cooking process and additional ingredients added at home (listed under “What you’ll need”) will affect total values.
Ingredients contain
1 red onion
red onion
1 shallot
1 garlic clove
1 soy sauce sachet (8ml)
water, soya bean, wheat (gluten), salt, alcohol (ethanol)
1 bag of walnuts (25g)
walnut (100%). May contain peanut, sesame & other nuts
1 tsp dried sage
100% sage
120g shredded kale
1 Knorr vegetable stock cube
Salt, vegetable fats (palm, shea butter, sal butter), potato starch, yeast extract, sugar, onion powder (2.3%), carrots (1.5%), herbs (parsley, tarragon), spices (celery seeds, garlic, turmeric, pepper, parsley roots), tomato puree powder, red bell pepper (0.2%), caramel syrup, flavourings (contain celery), leek, maltodextrin.
1 balsamic vinegar sachet (15ml)
wine vinegar, concentrated grape must, potassium metabisulphite (sulphites)
120g traditional puff pastry
wheat flour (gluten), butter (milk), sea salt (without anti-caking agent) water. May contain nuts.
250g chestnut mushrooms
chestnut mushrooms
1 white potato
  • Allergens highlighted by † (gluten, soya, nut, celery, sulphites, milk)

In addition to the recipe specific allergen information provided, due to production and packing methods Gousto boxes may also contain low levels of the following allergens: Cereals containing gluten; Crustaceans; Eggs; Fish; Peanuts; Soya; Milk; Nuts: almonds, hazelnuts, walnuts, cashews ,pecan nuts ,brazil nuts, pistachio nuts, macadamia nuts; Celery; Sesame; Sulphur dioxide and Sulphites; Lupin; Molluscs; Mustard.

Cooking Instructions
Instructions for 2 people (double for 4)
1 2480 - Mushroom Wellington with Onion Gravy & Mash

Preheat the oven to 200°C/ 180°C (fan)/ 395°F/ Gas 6 and boil a full kettle

Peel the potatoes and chop them into large, bite-sized pieces

Peel and finely slice the red onion[s]

Peel the shallot[s] and garlic

2 2480 - Mushroom Wellington with Onion Gravy & Mash

Add the chopped potatoes to a pot with plenty of boiled water and a generous pinch of salt and bring to the boil over a high heat

Once boiling, reduce the heat to medium and cook for 12-15 min or until fork-tender

Once done, drain and return to the pot with a large knob of butter and a splash of milk and mash until smooth

Season with salt and pepper – this is your mash

3 2480 - Mushroom Wellington with Onion Gravy & Mash

Meanwhile, add the garlicshallot[s], chestnut mushrooms, dried sage and walnuts to a food processor and pulse for 3 secs until roughly blitzed - this is your mushroom mixture

Heat a large, wide-based pan (preferably non-stick) with a drizzle of olive oil over a medium-high heat

Once hot, add the mushroom mixture and soy sauce to the pan and cook for 3-4 min or until all the liquid has been absorbed

4 2480 - Mushroom Wellington with Onion Gravy & Mash

Meanwhile, unroll the puff pastry and cut it into 2 [4] squares

Line a baking tray with non-stick baking paper and add the pastry squares

Divide the mushroom mixture evenly between the pastry squares, covering one half and reserve the pan

Fold the pastry over the mushroom mixture to form a sealed parcel

Put the tray in the oven for 20-25 min or until the pastry is golden - this is your mushroom wellington

5 2480 - Mushroom Wellington with Onion Gravy & Mash

Once the wellington is in the oven, cut 1 [2] piece[s] of tin foil approx. the size of a sheet of A3 paper

Lay the shredded kale in the middle with a knob of butter and 1 tbsp [2 tbsp] water and scrunch the edges of the foil around the kale to form a sealed parcel and place on a separate baking tray

Add the the tray to the oven for 10-15 min or until tender

6 2480 - Mushroom Wellington with Onion Gravy & Mash

Return the reserved pan to a medium-high heat with a knob of butter

Once hot, add the sliced red onion with 1 tsp [2 tsp] sugar and the balsamic vinegar and cook for 5-6 min until caramelised

Meanwhile, dissolve half [all] the Knorr vegetable stock cube in 250ml [500ml] boiled water

7 2480 - Mushroom Wellington with Onion Gravy & Mash

Once the onions have caramelised, add 1 tsp [2 tsp] flour to the pan and cook for 1 min, stirring until the onions are evenly coated in the flour

Add the stock and cook for 7-8 min or until thickened to a gravy-like consistency – this is your onion gravy


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Serve the mushroom wellington over the mash with the shredded kale to the side

Pour the onion gravy all over


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