Seventeen ingredients and an hour and a quarter, with the lentils and the sweet potatoes cooking at the same time in two different pans.
A shepherd's pie is usually minced lamb under white mashed potato. This one is whole green or brown lentils under orange sweet potato mash, and both substitutions are deliberate rather than incidental.
Why This Recipe Works
- Simmering the lentils in vegetable broth rather than water gives the filling its savoury base.
- Tomato paste and Worcestershire cooked for a minute in the pan deepen a filling that has no meat in it.
- A cornstarch slurry thickens the filling so the mash sits on top rather than sinking into it.
- Boiling the sweet potatoes very tender is what lets them mash smooth enough to pipe.
- Twenty minutes at 400 degrees browns the ridges of the mash without drying the filling underneath.
Ingredient Notes
- Green or brown lentils
- A cup, dry and rinsed. Green or brown specifically — they hold their shape, which is why the finished filling shows whole lentils rather than a purée.
- Sweet potatoes
- Two pounds, peeled and cubed. Orange mash rather than white potato is one of the two things that make this dish what it is.
- Worcestershire sauce
- A teaspoon, and the recipe offers a vegetarian version. Worth checking the bottle if that matters here.
- Butter or olive oil, milk or plant milk
- The recipe allows either in both places, so the mash can be made dairy-free without changing anything else.
How to Make It
Simmer the lentils
Simmer lentils in 2 1/2 cups broth until tender, about 20 to 25 minutes; drain any excess.
Meanwhile, mash the sweet potatoes
Meanwhile boil sweet potatoes until very tender, drain, and mash with butter, milk, half the salt, and pepper.
Build the filling base
Heat oil in a skillet, cook onion and carrot 5 minutes, then add garlic, tomato paste, thyme, and Worcestershire for 1 minute.
Lentils, peas, thicken
Add cooked lentils, remaining broth, peas, and cornstarch slurry. Simmer until the brown filling is thick but moist.
Mash on top, no cheese
Spread filling in a baking dish and pipe or spoon the orange sweet potato mash over it. Do not add cheese.
Twenty minutes at 400F
Bake at 400 degrees Fahrenheit for 20 minutes until hot and lightly browned at the ridges. Finish with thyme.
The Dish, Bottom to Top - and What Is Missing
A shepherd's pie has three parts and this recipe replaces or removes all three. Read a cut section from the dish upward and every layer is a decision away from the classic.
No cheese - the third change
Step 5 says it outright: do not add cheese. This is where a shepherd's pie usually gets a grated layer, and its absence is what leaves the sweet potato itself as the browned surface. Finished instead with fresh thyme, off the heat.
The ridges
Piped or forked, then 20 minutes at 400F until hot and LIGHTLY BROWNED AT THE RIDGES. Ridges are the only reason a mash browns unevenly enough to look like this; a flat surface bakes uniformly pale.
The mash - orange, not white
2 lb of sweet potatoes boiled very tender and mashed with 2 tbsp butter or olive oil, 1/3 cup milk or plant milk, half of the 1/2 tsp salt and 1/4 tsp pepper, then piped or spooned over. The second substitution, and the one you see first: the classic is white potato and this is deliberately not.
The base - lentils where the mince would be
1 cup of dry green or brown lentils simmered 20 to 25 minutes in 2 1/2 cups of vegetable broth, with 1 diced onion, 2 diced carrots, 2 garlic cloves, 1 tbsp tomato paste, 1 tsp dried thyme, 1 tsp Worcestershire and 1 cup of frozen peas. Green or brown lentils hold their shape - you want WHOLE lentils with visible carrot and peas, not a purée standing in for mince. There is no ground meat anywhere in this recipe.
The dish, and the thickening
A baking dish holding a filling simmered until thick but moist, with 1 tbsp of cornstarch slaked in 2 tbsp of water. The thickening is structural: mash spooned onto a loose filling sinks into it, and the finished pie shows two clean layers.
Success Tips
- Start the lentils and the sweet potatoes together; they take about the same time.
- Let the filling get properly thick before the mash goes on, or it will sink into it.
- Pipe or fork ridges into the mash — the ridges are what brown in the oven.
Serving Ideas
Six servings from a white oval dish, the brown lentil filling with its diced carrot and green peas under the piped orange sweet potato mash, browned at the ridges and finished with fresh thyme.
Frequently Asked Questions
Is there any meat in this?
None. The filling is whole lentils with carrot and peas, and no raw animal protein is used anywhere in the recipe.
Can I put cheese on the mash?
No. Step 5 rules it out, and the finished dish browns at the ridges of the sweet potato itself.
Could I use regular potatoes?
The recipe uses sweet potato, and the orange mash is one of the defining components of this dish.
