Preheat the oven to 200°C/400°F/gas 6. Put 1 chicken breast, with its skin left on, in a bowl. Add 8 trimmed sticks of asparagus, 6 halved cherry tomatoes and the leaves from 1 sprig of fresh rosemary plus a whole sprig of rosemary as well. Toss everything together with a pinch of sea salt and freshly ground black pepper and a drizzle of olive oil. Put the veg into a tinfoil tray and place the chicken and rosemary sprig on top. Season well. Add some white wine and cook in the middle of the oven for 25 to 3...