Mushroom Lentil Shepherd’s Pie

Ingredients

• 1.2 kg (2.5 lb)Russet or Yukon Gold potatoes, peeled and cut into even 2.5 cm (1-inch) chunks
• 120 ml (½ cup)Unsweetened non-dairy milk
• 56 g (¼ cup)Vegan butter or olive oil
• 15 g (¼ cup)Nutritional yeast (optional)
• 1 tsp, or to tasteSalt
• ½ tsp, or to tasteBlack pepper
• 2 tbspOlive oil
• 2 large (about 2 cups diced)Yellow onions, diced
• 4 clovesGarlic, minced
• 2 large (about 1½ cups)Carrots, finely diced
• 2 stalks (about 1 cup)Celery, finely diced
• 680 g (1.5 lb)Cremini mushrooms, thinly sliced
• 1 tspDried thyme
• 1 tspDried rosemary, crushed
• 240 ml (1 cup), optionalDry red wine
• 185 g (1 cup)Brown or green lentils, rinsed
• 950 ml (4 cups)Vegetable broth
• 2 tbspTomato paste
• 2 tbspSoy sauce or tamari
• 1 cupFrozen peas
• 2 tbspPlain flour or cornflour
• To tasteSalt and black pepper
• To tasteFresh parsley, chopped, for garnish

Instructions

1. 1

   Boil the potatoes

   Put the peeled, chopped potatoes in a large pan and cover with cold salted water by at least 2.5 cm (1 inch). Bring to the boil over high heat, then lower the heat to maintain a steady simmer. Cook for 15–20 minutes, until very tender and easily pierced with a fork.

2. 2

   Mash the potatoes

   Drain the potatoes well and return them to the hot, empty pan. Leave for a minute so excess moisture can steam away, then add the vegan butter or olive oil, non-dairy milk, nutritional yeast if using, salt and pepper. Mash until smooth and creamy, taking care not to overwork them. Taste and adjust the seasoning, then set aside.

3. 3

   Soften the vegetables

   While the potatoes cook, heat 2 tablespoons of olive oil in a large, deep frying pan or Dutch oven over medium heat. Add the onions, carrots and celery and cook for 8–10 minutes, stirring occasionally, until softened and the onions are translucent.

4. 4

   Brown the mushrooms

   Add the garlic, thyme and rosemary and cook for 1 minute, until fragrant. Raise the heat to medium-high, add the mushrooms and a pinch of salt, then cook for 10–12 minutes, stirring occasionally. Let the mushrooms release their liquid and then brown; this step develops the filling’s flavour.

5. 5

   Thicken the base

   Sprinkle the flour over the mushroom mixture and stir continuously for 1 minute to cook it through. Add the tomato paste and soy sauce or tamari, stirring to combine.

6. 6

   Reduce the wine

   If using wine, pour it into the pan to deglaze, scraping up the browned bits from the bottom with a wooden spoon. Let it reduce by about half, which should take 2–3 minutes.

7. 7

   Simmer the lentils

   Add the rinsed lentils and vegetable broth, stir, and bring to the boil. Reduce the heat to low, cover and simmer for 35–45 minutes, until the lentils are tender but still hold their shape and the filling has thickened to a stew-like consistency.

8. 8

   Finish the filling

   Heat the oven to 200°C (400°F). Stir the frozen peas into the cooked filling and cook for another 2–3 minutes, until heated through. Taste and adjust the salt and pepper.

9. 9

   Assemble the pie

   Spoon the hot filling into a 23 × 33 cm (9 × 13-inch) baking dish or a similar-sized casserole dish and spread it evenly. Add the mashed potatoes, placing spoonfuls around the edge first before filling the middle. Spread the topping gently over the surface, then use a fork to make ridges or swirls if you like.

10. 10

    Bake until golden

    Set the baking dish on a baking sheet to catch any drips. Bake for 25–30 minutes, until the filling bubbles and the potato peaks are golden. For a more deeply browned top, grill for the final 1–2 minutes, watching carefully to prevent burning.

11. 11

    Rest and serve

    Take the pie out of the oven and leave it to rest for at least 10–15 minutes so the filling can set. Garnish with chopped fresh parsley before serving.

What is mushroom lentil shepherd’s pie?

Shepherd’s pie is a British and Irish-style baked dish traditionally made with a savoury meat filling beneath mashed potato. This version replaces the meat with lentils and mushrooms for a substantial, plant-based centre.

Lentils bring a firm, hearty texture, while browned mushrooms add savoury depth. A layer of creamy mash and a bubbling, golden top make it a comforting dish to serve straight from the baking dish.

Nutrition and macros by portion

The nutrition label shows one serving as written: 450 calories, 18g protein, 0g carbs, 0g fat.

The potatoes and lentils provide most of the carbohydrates, while olive oil, vegan butter or olive oil in the mash contribute fat. Lentils, mushrooms and peas supply plant protein. Pair a portion with green vegetables or salad for a fresh side.

Choose potatoes for the topping

Russets: These make a light, fluffy mash that spreads easily over the filling.

Yukon Golds: These have a naturally creamier texture, giving the topping a richer feel.

Dry them well: After draining, returning the potatoes to the hot pan for a minute lets excess steam escape and helps avoid a watery mash.

Build flavour in the filling

Brown the mushrooms: Give them the full 10–12 minutes so their released liquid can cook off and their surfaces can colour. Avoid rushing this stage, as it gives the filling much of its savoury character.

Deglaze the pan: Wine loosens the browned bits after the mushrooms cook; scrape these into the filling. If you are not using wine, the recipe calls for extra vegetable broth instead.

Season in layers: Soy sauce or tamari, tomato paste, herbs and the final salt and pepper each contribute to the gravy’s flavour.

Keep the lentils intact

Brown or green lentils are specified because they keep their shape through the simmer. Red lentils soften much more and can make the filling mushy.

Start checking near the lower end of the 35–45 minute simmer. The lentils should be tender but still distinct, and the filling should be thick enough to sit beneath the potato topping.

Make a smooth potato layer

Add the non-dairy milk and vegan butter or olive oil to the hot potatoes so they are easier to mash evenly. Nutritional yeast is optional, but it adds a savoury note.

Mash only until smooth; working the potatoes too much can make them gummy. Spread them gently over the filling and make fork ridges if you want extra browned peaks.

Bake, then let it settle

The pie is ready when the filling bubbles and the potato topping has golden peaks after 25–30 minutes at 200°C. A brief 1–2 minutes under the grill can deepen the colour, but the top can burn quickly.

Rest the pie for at least 10–15 minutes before serving. This gives the filling time to settle and makes portions easier to lift.

What to serve with it

A crisp green salad or steamed green vegetables make a fresh contrast to the rich, soft filling and mash. Serve the pie as the main dish, with parsley scattered over the top just before it goes to the table.

Recipe notes & tips

• Cut the potatoes into similarly sized chunks so they cook at the same rate.
• Let the potatoes steam-dry briefly after draining before mashing.
• Use a wide pan for the mushrooms so they have room to brown.
• Keep the lentils at a gentle simmer and check them before the full cooking time is up.
• Place the casserole dish on a baking sheet to catch any filling that bubbles over.
• Rest the pie for at least 10–15 minutes before cutting portions.

Variations

• Skip the wine: Use additional vegetable broth in its place.
• Make it gluten-free: Use cornflour instead of plain flour and choose tamari.
• Change the mushrooms: Use another variety in place of some or all of the creminis.
• Choose your potato: Use Russets for a fluffier mash or Yukon Golds for a creamier one.
• Add more herbs: Adjust the thyme or rosemary to suit your taste.

Common mistakes to avoid

• Rushing the mushrooms: They need 10–12 minutes to release their liquid and brown; give them time in the pan.
• Using red lentils: They can lose their shape; use brown or green lentils as specified.
• Skipping the flour cook: Stir it into the vegetables for 1 minute before adding liquid to avoid a raw flour taste.
• Over-mashing the potatoes: Stop once they are smooth to help prevent a gummy texture.
• Spreading mash too roughly: Spoon it on gently to keep the filling layer in place.
• Cutting too soon: Rest the pie for at least 10–15 minutes so the filling can settle.

How to store

Cool leftovers, cover and refrigerate for up to 3 days. Reheat portions in the oven or microwave until piping hot throughout.

Frequently asked questions