Source: FOSS Cooking (community recipes)
The filling is where shepherd's pie lives or dies. Heat oil in a wide, heavy-bottomed pan over a high flame. Once smoking, add the minced lamb and leave it untouched for two minutes — you're not stirring, you're frying until the base takes on serious colour. Break it apart only once it's darkened, then continue cooking for another minute to render the fat properly. This Maillard reaction builds the savoury backbone of the dish. Reduce to medium heat, add finely diced onion and carrot, and cook for five minutes until softened and beginning to caramelise. Stir in the tomato paste and cook for a further minute to deepen its flavour — raw tomato paste tastes tinny and thin. Pour in the beef stock, add the paprika, and simmer for twelve to fifteen minutes until the liquid reduces by half and the sauce coats the back of a spoon. The reduction concentrates the lamb's umami and thickens naturally through gelatin. Fold in the frozen peas in the last two minutes — they don't need cooking, only warming through. Season hard with salt and pepper.
Meanwhile, cut mealy potatoes into equal 3 cm chunks and boil them in salted water at a rolling boil for fifteen to eighteen minutes. They're ready when a knife passes through with zero resistance — overcooked potatoes waterlog and turn gluey when mashing|mashed. Drain thoroughly and return to the hot pan for thirty seconds off heat to evaporate surface moisture. This stops the mash becoming cloying. Mash with butter first, then add milk gradually whilst folding — don't beat the potatoes or you'll activate the starch and produce a dense, gluey paste. The texture should be loose enough to pipe through a nozzle but firm enough to hold peaks. Season with salt, white pepper, and a pinch of nutmeg — just enough that you feel it, not taste it directly.
Transfer the lamb filling to a buttered casserole dish and smooth the surface level. Pipe the potato mash across the top in ridges or peaks — this surface area chars and crisps in the oven, delivering texture against the creamy interior. Bake at 200°C for thirty-five to forty minutes. The dish is ready when the potato topping is golden-brown at the peaks and the filling bubbles at the edges. Serve straight from the casserole.
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