Lentil Cottage Pie

Ingredients

• 250g green lentils, rinsed
• 900ml hot vegetable stock
• 400g tin chopped tomatoes
• 2 medium onions, finely diced
• 2 medium carrots, diced
• 2 celery sticks, diced
• 3 garlic cloves, crushed
• 2 tbsp tomato purée
• 1 tsp dried thyme
• 2 tbsp olive oil
• Salt and freshly ground black pepper, to taste
• 1kg potatoes, peeled and chopped
• 50g butter
• 150ml milk, warmed
• 100g mature cheddar, grated
• Buttered peas and greens, to serve
• Fresh chives, to serve

Method

1. Rinse the lentils, then tip them into a saucepan with the hot vegetable stock, tinned tomatoes and bay leaf. The stock and tomato juice are what break the lentils down into something rich rather than chalky — bare tomatoes alone would taste of tin. Bring to a gentle simmer, cover, and cook for 20–25 minutes until tender but still holding their shape. Drain off any excess liquid if it looks soupy — you want a thick, spoonable mixture.
2. While the lentils cook, heat the olive oil in a heavy pot over medium heat. Add the onions, carrots, celery and parsnip with a good pinch of salt and sweat for 10–12 minutes, stirring now and then, until everything is soft and starting to caramelise at the edges. Don't crowd the pan — if your dice fills it more than two-thirds deep, work in two batches, or you'll steam the veg instead of browning them.
3. Add the mushrooms and cook for another 4–5 minutes until they've given up their water and the pan is dry again. Stir in the garlic and tomato purée and cook for just 1–2 minutes — the garlic should turn fragrant and pale gold, no darker. Watch it: burnt garlic turns the whole pie bitter, and there's no rescuing it.
4. Tip the vegetables into the lentils along with the thyme and Worcestershire sauce. Simmer uncovered for 8–10 minutes, stirring occasionally, until thick and glossy. Taste, season, taste again — the filling should taste deeply savoury and slightly concentrated. Adjust the salt and pepper now, not at the table. Fish out the bay leaf.
5. Meanwhile, boil the potatoes in well-salted water — it should taste like the sea — for 15–18 minutes until a knife slides through without resistance. Drain thoroughly and leave to steam-dry for a minute (water means watery mash), then mash with the butter and warm milk until smooth and fluffy. Season well.
6. Spoon the filling into an ovenproof dish and level it. Spread the mash over the top in an even layer, then rough up the surface with a fork — those peaks are what go golden and crisp. Scatter the cheddar evenly across the top.
7. Bake at 200°C (fan 180°C) for 25–30 minutes, until the top is deeply golden and the filling bubbles up around the edges.
8. Rest for 5 minutes so the topping sets. Serve straight from the dish, scatter the snipped chives generously over the golden crust, add a final crack of black pepper, and bring the green salad or buttered greens to the table alongside.