Saffron Halloumi and Puy Lentil Bake with Roasted Grapes

["Preheat your oven to 200°C (180°C fan/Gas Mark 6).","Rinse the Puy lentils under cold water.","Finely chop the red onion and mince the garlic.","Cut the halloumi into 1.5cm cubes.","Halve the red grapes if they are large.","Strip the leaves from the thyme sprig and roughly chop.","In a large ovenproof dish, combine the rinsed Puy lentils, chopped red onion, minced garlic, chopped thyme, olive oil, salt, and black pepper. Stir well to combine.","In a small bowl, steep the saffron threads in 2 tablespoons of hot water for 5 minutes.","Pour the saffron water over the lentil mixture and stir to distribute the colour and flavour.","Add the halloumi cubes and red grapes to the ovenproof dish. Toss gently to coat them with the lentil mixture.","Cover the dish tightly with foil or a lid.","Bake for 25 minutes.","Remove the foil, stir the mixture gently, and bake for another 15 minutes, or until the lentils are tender and the halloumi is golden and slightly softened. The grapes should be softened and slightly caramelised.","Squeeze the juice of half a lemon over the bake just before serving. Taste and adjust seasoning if necessary."]