1. Heat the oven to 200C/180C fan/gas 6. Put the grapes on a baking tray, drizzle over 1 tbsp of the oil and season well. Put in the oven and roast for 20-25 mins until juicy. Meanwhile, mix the remaining oil with the red wine vinegar, lemon juice and garlic. Season to taste.
2. Once the grapes are ready, warm the lentils through according to pack instructions, then toss with the grapes and their juices. Spoon onto a serving plate and stir through most of the mint and all the rocket. Top with the Président Brie slices, drizzle over the dressing then scatter with the lemon zest and the rest of the mint to serve.