1. Preheat the oven to gas 7, 220°C, fan 200°C. Tip the meatballs, broccoli and onions into a roasting tin and drizzle over the oil. Toss everything together; season well. Roast in the oven for 15-20 mins until the veg is tender.
2. Stir in the lentils, beetroot and radishes and mix well. Roast for another 10-15 mins until the lentils are piping hot and the meatballs cooked through.
3. Mix the yogurt with the coriander and garlic; spoon over the traybake. Swirl into the lentils to serve.
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For top tips on protecting you and your family when preparing raw meat and poultry, visit Food Safety in the Home.