This is a standard lamb cottage pie with one real difference: grated beetroot cooked into the filling. It adds a faint earthiness and turns the meat mixture a deep red, but it doesn’t taste like a beet salad — the flavor mellows completely during the simmer. If you want a cottage pie that’s a little more interesting than the usual without being fussy, this is a solid weeknight option.
What makes this version work
Two things matter here. First, grate the beetroot rather than dicing it. Grated beetroot breaks down into the filling during the 20-minute simmer, so you get the flavor and color distributed evenly without chunks that stay firm. Diced beet would still be toothsome when everything else is soft. Second, drain the fat after browning the lamb before you add the beetroot and carrot. Lamb can render a surprising amount of fat, and if you skip this step the filling turns greasy rather than saucy — the stock and tomato paste can’t thicken properly around a pool of fat.
If something goes sideways
- Filling is watery when you go to assemble: The beetroot releases moisture as it cooks. If your filling looks thin after the simmer, turn the heat up briefly and stir for 3–4 minutes uncovered until it tightens. A loose filling will make the mash sink.
- Mash slides off or sinks into the filling: Let the filling cool for 10 minutes before you spoon the mash on top. Hot filling and hot mash together creates steam that breaks the surface. A slightly cooled filling holds the topping in place.
- Mash browns unevenly in the oven: Run a fork across the surface in light ridges before baking — this gives the peaks somewhere to catch color. A flat, smooth top tends to brown in patches.
- Lamb reads pink after the full cook time: Ground lamb must reach 160°F (71°C) at the center. If you’re unsure, use an instant-read thermometer pushed into the filling through the side of the dish before pulling it from the oven.
- Filling tastes flat: Beetroot can dull salt perception slightly. Taste the filling after the simmer and adjust salt before assembling — it’s the last easy moment to season the meat layer.
About the ingredients
- Raw beetroot: Use raw, not pre-cooked vacuum-packed beets. Pre-cooked beets are too soft and too sweet, and they’ll turn the filling muddy. Wear gloves when grating — the stain is stubborn.
- Floury potatoes: Yukon Gold works well. Waxy potatoes (like red-skinned varieties) don’t mash smoothly and can turn gluey. If Yukon Gold isn’t available, russets are a reliable substitute.
- Beef stock with lamb: It sounds odd but it works fine — the stock is just background body. Low-sodium is worth using here because the filling reduces and concentrates; full-sodium stock can make the finished dish quite salty.
- Egg yolk in the mash: Skip the garnish of extra yolk on top if you were considering it — not worth the extra dish. The yolk beaten into the mash before spreading is what gives the topping its color and a slightly richer set.
Storage and reheating
Refrigerate leftovers in the baking dish covered with foil or in an airtight container for up to 3 days. To reheat, cover with foil and warm in a 350°F (175°C) oven for 20–25 minutes until the filling is bubbling at the edges and the internal temperature hits 165°F (74°C). The microwave works for single portions — cover loosely and heat in 90-second bursts, stirring the filling if you can access it. For freezing, cool completely, portion into freezer-safe containers, and freeze for up to 2 months. Thaw overnight in the fridge before reheating; don’t bake from frozen or the mash dries out before the center heats through.
Lamb Mince and Beetroot Cottage Pie
Ingredients
Lamb Mince Filling
2 tablespoons olive oil - extra virgin recommended
1 medium onion - large, finely chopped
2 cloves garlic - minced
500 grams ground lamb (minced lamb) - preferably grass-fed- 2 small beetroots - medium, peeled and grated
1 small carrot - medium, diced
2 tablespoons tomato paste - organic preferred
1 cup beef stock - low sodium
2 teaspoons thyme - fresh, leaves, chopped
1 teaspoon salt - to taste
½ teaspoon ground black pepper - freshly ground
Mashed Potato Topping
1.5 kilograms potatoes - floury variety like Yukon Gold, peeled and cubed
½ cup milk - whole milk, warmed
100 grams butter - unsalted, softened
1 large egg yolk - beaten
Instructions
- Begin by heating the olive oil in a large skillet over medium heat. Sauté the onions until golden brown, releasing their natural sweetness, about 8 minutes.
- Add the minced garlic and cook until fragrant, approximately 1-2 minutes.
- Increase the heat and add the lamb mince. Cook until browned, breaking up any clumps, for about 10 minutes. Drain excess fat if necessary.
- Stir in the grated beetroot and diced carrot, cooking for another 5 minutes until they start to soften.
- Add the tomato paste, beef stock, thyme, salt, and pepper. Bring to a simmer, then reduce heat to low and cook uncovered for 20 minutes, allowing flavors to meld and the mixture to thicken slightly.
- Meanwhile, cook the potatoes in salted boiling water until tender, about 15-20 minutes. Drain well and return to the pot.
- Mash the potatoes until smooth, then stir in the warmed milk, butter, and beaten egg yolk. Season with salt and pepper.
- Preheat your oven to 200°C (390°F).
- Spoon the lamb mixture into a large baking dish, then gently spread the mashed potatoes over the top, smoothing the surface with a spatula.
- Bake in the preheated oven for 30-35 minutes, or until the topping is golden brown and crisp.
Notes
Nutrition
Your questions, answered
Can I use pre-cooked or canned beetroot instead of raw?
No — pre-cooked beetroot is too soft and too sweet for this recipe. Raw beetroot grates easily and breaks down during the simmer, giving the filling its texture and balanced flavor without turning it sugary.
Can I swap the lamb for beef or turkey?
Yes. Ground beef works as a straight swap and needs the same 160°F (71°C) internal temperature. Ground turkey also works but must reach 165°F (74°C) — don’t pull it early or serve it with any pink in the filling.
Do I need a separate pot for the potatoes, or can I use the same pan as the filling?
You need a separate pot for boiling the potatoes — they need to be fully submerged in water. You can, however, make the filling in an oven-safe skillet and assemble directly in it, which saves washing a baking dish.
How do I know when the pie is done baking?
The mash should be golden on the ridges and the filling should be visibly bubbling around the edges of the dish. If you want certainty, an instant-read thermometer inserted through the side into the filling should read at least 160°F (71°C).
Can I make this ahead and bake it the next day?
Yes, and it holds up well. Assemble the full pie, cover tightly, and refrigerate for up to 24 hours before baking. Add 10 extra minutes to the bake time since you’re starting from cold.
My mash always turns gluey — what am I doing wrong?
Over-mixing is the most common cause, especially with a stand mixer or food processor. Mash by hand with a potato masher or ricer, and stop as soon as the lumps are gone. Waxy potato varieties also contribute to a gluey texture — stick with Yukon Gold or russets.
More mince recipes to try
- Savory Lamb Rosemary Pies
- Mediterranean Lamb Feta Pie
- Wild Venison Mushroom Pies
- Hearty Beef Cauliflower Bake
