Lentil Cottage Pie That Costs Two Dollars a Serving
A Saskatchewan lentil cottage pie with mushrooms under a potato top. Six servings at about two dollars each, ready in 80 minutes, and it freezes well.
Ingredients
| dry green lentils, rinsed | 300 g |
| cremini mushrooms, roughly chopped | 340 g |
| russet potatoes, peeled and cut into chunks | 1.4 kg |
| carrots, finely diced | 2 medium |
| celery, finely diced | 2 stalks |
| yellow onion, diced | 1 |
| garlic, minced | 3 cloves |
| tomato paste | 30 ml |
| vegetable broth | 500 ml |
| milk, 2 percent | 125 ml |
| butter | 30 g |
| olive oil | 30 ml |
| dried thyme | 5 ml |
| salt, divided | 6 g |
| ground black pepper | 2 ml |
Steps
- 1Simmer the lentils in a pot with plenty of water. Bring to a boil, then cook for 20 to 25 minutes until tender but still holding their shape. Drain and set aside.
- 2Boil the potatoes at the same time in salted water for 18 to 20 minutes, until a knife slides through with no resistance.
- 3Brown the mushrooms in the olive oil in a large skillet over medium-high heat, 8 to 10 minutes, stirring as little as you can bear.
- 4Soften the onion, carrot and celery in the same pan for another 6 minutes, then stir in the garlic, thyme, half the salt and the pepper and cook one minute more.
- 5Toast the tomato paste for a full minute until it darkens, then add the broth and the drained lentils. Simmer 8 to 10 minutes until it thickens into something saucy rather than soupy.
- 6Mash the drained potatoes back in their hot pot with the butter, milk and remaining salt.
- 7Assemble in a 23 by 33 cm baking dish with the oven at 200°C. Spread the lentil mixture, spoon the mash over the top, and drag a fork across the surface to raise peaks and ridges.
- 8Bake 25 to 30 minutes until the peaks are golden, then rest 10 minutes before serving.
Lentils bring plant protein and fibre in the same package, along with iron and folate, which is useful if you are eating less meat than you used to. Fibre is also what your gut bacteria live on, and the signals your gut sends back matter more than most people assume. They are filling in a way a plain starch is not, so a smaller portion does more work.
This is a lentil cottage pie built on Saskatchewan green lentils instead of ground meat, with mushrooms doing the savoury work under a potato top. It makes six servings for roughly two dollars each, takes about 80 minutes from start to finish, keeps for four days in the fridge and freezes for three months. Ingredient costs are estimates based on typical Ontario supermarket shelf prices in September 2026 and will vary by store, city and season.
The Canadian angle is better than most people realize. Saskatchewan Pulse Growers reports that Canada is the world's largest producer and exporter of lentils, with roughly 90 percent of the Canadian crop grown in Saskatchewan, and Statistics Canada put lentil exports at close to $2.3 billion in 2023. A bag of green lentils is one of the few genuinely cheap staples that is also grown a couple of provinces over. If this one lands, the red lentil soup with coconut and spinach is the next stop in the same bag.
On the budget side, this sits in the same bracket as our maple butternut squash soup and the tomato and white bean bruschetta at about $1.41 a serving, which is worth knowing in a year when one in three Ontario children lives in a food-insecure home.
What Makes a Vegetarian Cottage Pie Taste Like the Real Thing?
A vegetarian cottage pie lives or dies on savoury depth, and in this lentil cottage pie two ingredients supply nearly all of it. The first is the mushrooms, browned properly rather than stewed. The second is the tomato paste, which most people dump straight in with the liquid and waste.
Give the paste sixty seconds alone in the hot pan before the broth goes in. It darkens from bright red to brick, and that colour change is concentrated savoury flavour you cannot get back once liquid arrives. The same trick works in chilli, bolognese and any braise you make this autumn.
How Do You Brown Mushrooms Without Steaming Them?
To brown mushrooms properly, give them space and then leave them alone. They will look wet and defeated for the first five minutes while their water cooks off, and that is the stage where most people panic and start stirring. Stirring at that point drops the pan temperature and you end up with grey mushrooms in their own liquid.
Hold your nerve. Once the water has gone, the mushrooms hit the hot surface and turn deep brown and meaty within a couple of minutes. That browning is the difference between a proper cottage pie and vegetables wearing a potato hat. If your pan is crowded, work in two batches rather than one sad crowded one.
What Should You Expect From a Make Ahead Cottage Pie?
Treated as a make ahead cottage pie, this lentil cottage pie improves overnight, which is not true of every dish that claims it. The lentils keep absorbing the tomato and thyme, and day two tastes noticeably rounder than day one. Four days in the fridge is the sensible limit.
For the freezer, cool it completely first, then freeze whole or in single portions for up to three months. Reheat until steaming right through to the centre. If you are doubling the batch while the pot is already out, that is the efficient move, and a grated handful of cheddar over the mash before baking is never a bad decision. For a cold lunch that survives the same treatment, our beet and barley salad holds up for four days too.
What Else Do People Ask Before They Make This?
Can you use red lentils instead of green?
You can, but expect a different dish. Red lentils break down into a puree within about 15 minutes, so you lose the texture that stands in for ground meat. If red is what you have, shorten the simmer and accept a softer, more stew-like base. Green or brown lentils hold their shape and work far better here.
How do you keep the potato top from going gluey?
Return the drained potatoes to the hot, dry pot for a minute so the surface steam escapes, then mash by hand rather than in a food processor. Overworking releases starch and turns the mash into paste. Warm milk folds in more easily than cold, and a lighter hand at the end keeps the texture fluffy.
Can you make it dairy-free?
Yes. Swap the butter for olive oil and the milk for an unsweetened plant milk with no vanilla in it. Oat milk mashes particularly well because of its body. The flavour shifts slightly toward the savoury side, which suits this dish, and everything else in the recipe is already free of dairy.
Is this suitable for a household watching sodium?
It can be. The salt in the recipe is modest, so the variable is your broth. Choose a low-sodium vegetable broth and taste before adding the second half of the salt. Anyone managing blood pressure or kidney concerns should follow the advice their own clinician has given rather than a general recipe note.
Does it work as a freezer meal for one person?
Very well. Bake the whole dish, cool it fully, then portion into single containers before freezing for up to three months. Reheat from frozen in the oven or defrost overnight first. Portioning after baking keeps the potato top intact, which reheating a raw assembled dish tends not to do.
Your next step
If you are working on cholesterol, blood sugar or simply eating more plants without losing the comfort food, a professional can build that around your actual week rather than an ideal one. Medimap lets you find dietitians and nutritionists near you and book in minutes, and if the underlying question is a health one, family practices in your area are searchable the same way. You can also search by clinic name or service. For more budget-friendly cooking and plain health explainers, browse the Medimap Health Hub.
Disclaimer. This recipe is general information, not medical or dietary advice, and nutrition figures are estimates. Anyone managing a diagnosed condition should follow guidance from their own clinician or registered dietitian.