Classic Cottage Pie

Ingredients

• 750 g beef mince, ideally 10-12% fat
• 2 onions, finely chopped
• 3 carrots, diced
• 3 celery sticks, diced
• 2 garlic cloves, finely chopped
• 600 ml beef stock
• 1 tbsp tomato purée
• 3 tbsp plain flour
• 2 tbsp Worcestershire sauce
• 2 bay leaves
• 1 tsp thyme leaves
• 2 tbsp olive oil
• 1½ kg floury potatoes, peeled and chopped
• 225 ml whole milk
• 75 g butter
• 150 g mature cheddar, grated
• ¼ tsp ground nutmeg
• 10 g chives, finely snipped
• Fine salt and black pepper

Method

1. Heat 1 tbsp olive oil in a large heavy pot over medium-high until it shimmers. Season the mince generously with salt and pepper, then brown in two batches; don't crowd the pan. Work in batches and let the pan recover its heat between them; colour is the base of the sauce. You want a deep mahogany crust and proper stuck bits on the base of the pot. Lift each batch out with a slotted spoon and set aside.
2. Drop the heat to medium and add the remaining 1 tbsp oil. Tip in the onions, carrots and celery with a good pinch of salt and cook gently for 20 minutes, stirring now and then, until everything is soft and sweet and just starting to catch gold at the edges. The salt pulls the water out so the veg sweetens rather than steams.
3. Stir in the garlic for 30 seconds, just until aromatic. Add the flour and tomato purée and stir for 2 minutes until everything is coated in a rusty paste; this cooks the raw flour out so the gravy tastes of beef, not paste.
4. Pour in the stock and Worcestershire sauce, scraping the brown stuck bits off the bottom of the pot. Return the beef, tuck in the bay leaves and thyme, and bring to a gentle simmer.
5. Simmer uncovered for 45 minutes, stirring occasionally, until the sauce has thickened to a glossy, spoon-coating gravy. Fish out the bay and thyme stalks.
6. While that's going, put the potatoes in a large pan and cover with cold water. Salt the water generously; it should have a clear savoury edge. Bring to the boil and cook for 15–18 minutes until a knife slides through cleanly. Drain and let them steam-dry in the colander for a couple of minutes; wet potatoes make heavy mash.
7. Tip the potatoes back into the pan. Warm the milk and butter together briefly, then pour over the potatoes and mash until smooth. Stir through three-quarters of the cheddar, a grating of nutmeg, and a good pinch of salt and pepper. Taste the mash; it should be properly seasoned on its own, before it ever meets the gravy.
8. Heat the oven to 220°C / 200°C fan / gas 7. Tip the beef into an ovenproof dish (or two smaller ones), spread the mash over the top in confident sweeps, then drag a fork across to rough up the surface; those ridges are what go crisp and golden. Scatter with the remaining cheddar.
9. Bake for 25–30 minutes, until the top is deep golden and the gravy is bubbling up around the edges. Let it sit for 5 minutes before serving; it'll be lava-hot.
10. Spoon onto warm plates straight from the dish, finish each portion with a crack of black pepper and a generous scatter of fresh chives over the bronzed, bubbling crust.