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Heat 1½ tbsp olive oil in a large pan over a medium heat and cook the onions for 2 mins. Add the beef mince, turn up the heat to medium-high and cook for 5 mins, stirring occasionally until the meat is browned.
Add the carrots and garlic, and cook for 2 mins. Stir in the stock cubes and 750ml boiled water. Bring to the boil, then stir in the lentils and brown sauce. Cover, reduce the heat and simmer gently for 20-30 mins until the filling is tender and thickened – remove the lid halfway through the cooking time if the mixture needs to reduce more.
Meanwhile, cook the sweet potatoes in a large pan of boiling water until tender. Drain and mash until smooth. Beat in the remaining olive oil and the spring onions.
Heat the grill to high. Spoon two-thirds of the filling into the base of an ovenproof dish and top with a third of the sweet potato mash. The leftover mince and potato will be used on day 4. Slide under the grill for 5 mins until browned in spots, then divide between plates and serve with brown sauce and some greens.