Shepherd's Pie with a Cheddar-Mustard Mash Crust
The ultimate comfort, with a sharp golden top
Shepherd’s pie is comfort cooking at its plainest, which is precisely why a little sharpness on top works such magic. Mature cheddar and a generous spoonful of English mustard are beaten through the mash, then more cheese is scattered over before baking, so the crust turns golden, crisp and gently fiery. Underneath sits a proper rich lamb filling. It is the same familiar dish, given a sharp, savoury lift.
Shepherd's Pie with a Cheddar-Mustard Mash Crust
Ingredients
- 2 tbsp olive oil
- 1 kg lamb mince
- 2 onions, finely chopped
- 3 carrots, diced
- 3 garlic cloves, crushed
- 2 tbsp tomato purée
- 1 tbsp plain flour
- 2 tsp Worcestershire sauce
- 2 sprigs fresh thyme
- 1 bay leaf
- 400ml lamb or beef stock
- 150g frozen peas
- 1.2kg floury potatoes (Maris Piper), peeled and chunked
- 75g butter
- 100ml whole milk
- 150g mature cheddar, grated
- 1.5 tbsp English mustard
- Salt and black pepper, to taste
Method
- Heat the oil in a large pan and brown the lamb mince over a high heat, then drain off excess fat and set the meat aside.
- Lower the heat, add the onions and carrots, and cook for 10 minutes until softened. Stir in the garlic for 1 minute.
- Stir in the tomato purée and flour and cook for 1 minute, then return the lamb to the pan.
- Add the Worcestershire sauce, thyme, bay leaf and stock. Simmer gently for 25-30 minutes until thickened, then stir in the peas and season. Discard the bay and thyme stalks.
- Meanwhile, boil the potatoes in salted water for 15-18 minutes until tender, then drain well and leave to steam-dry for a few minutes.
- Mash with the butter and milk until smooth, then beat in two-thirds of the cheddar and the English mustard. Season.
- Heat the oven to 200C (180C fan). Spoon the lamb into a large baking dish.
- Top with the mash, spreading to the edges, and rough up the surface with a fork. Scatter over the remaining cheddar.
- Bake for 30 minutes until the top is golden and crisp and the filling bubbles at the edges. Rest for 5 minutes before serving.
3 The Story
Shepherd’s pie belongs to a thrifty British tradition of using up leftover roast meat beneath a comforting blanket of mashed potato. The dish rose to prominence in the late eighteenth and nineteenth centuries, a period when the potato had become firmly established as a staple across Britain and Ireland and home cooks were looking for economical ways to stretch a Sunday joint through the week.
There is a genuine distinction worth keeping. Strictly speaking, a shepherd’s pie is made with lamb or mutton, the meat a shepherd would have to hand, while the near-identical cottage pie is made with beef. The two names were once used more loosely, but the lamb-versus-beef rule has hardened into convention, and using lamb here, as this recipe does, keeps faith with the name on the tin.
The hero of the dish is really the potato topping. Floury varieties such as Maris Piper or King Edward are the right choice, because they break down into a light, fluffy mash that crisps beautifully rather than turning gluey. Drying the drained potatoes briefly over a low heat or letting them steam off in the colander drives away excess water, which makes for a better mash and a crisper crust.
The twist plays to that crust’s strengths. Cheese and potato are old friends, and mature cheddar, with its firm, savoury sharpness, melts into the mash while the scattering on top blisters and browns in the oven. English mustard adds a quiet heat that you notice more as warmth than as fire, lifting the richness of both cheese and lamb. The pairing of cheddar and mustard is a thoroughly British one, familiar from Welsh rarebit and a good ploughman’s, so it sits naturally on a dish this rooted in the British table.
A few details lift the whole pie. Brown the mince hard for flavour, and drain off the rendered lamb fat so the filling does not turn greasy. Let the filling thicken properly before it goes under the mash, or the topping will sink. And roughing up the surface with a fork creates ridges and peaks that catch the heat and crisp, giving you that irresistible golden, craggy top that is the best part of any shepherd’s pie.
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